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A268260
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Number of length-(n+1) 0..7 arrays with new repeated values introduced in sequential order starting with zero.
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1
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57, 407, 2907, 20771, 148468, 1061632, 7594224, 54345509, 389060724, 2786424182, 19964380499, 143102062257, 1026171833136, 7361751375225, 52836226761762, 379380311345241, 2725291071400498, 19586141747713834, 140826889434423348
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 57*a(n-1) -1400*a(n-2) +19187*a(n-3) -157759*a(n-4) +765212*a(n-5) -1872339*a(n-6) +503475*a(n-7) +6299972*a(n-8) -2706851*a(n-9) -14207501*a(n-10) -11689832*a(n-11) -4172972*a(n-12) -680688*a(n-13) -40320*a(n-14)
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EXAMPLE
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Some solutions for n=5
..6....7....3....1....6....4....1....5....1....2....7....0....5....5....1....4
..0....3....1....2....1....0....4....0....4....1....0....0....2....0....4....2
..2....4....3....6....2....4....1....4....0....3....3....0....3....3....6....0
..3....0....5....4....7....7....5....1....2....4....4....7....7....1....0....5
..7....0....7....0....6....2....4....7....5....0....7....2....5....4....7....1
..6....6....6....5....5....6....5....5....0....5....2....4....7....6....2....6
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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