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A223157
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T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit
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3
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99, 989, 989, 16089, 25929, 16089, 215563, 1328305, 1328305, 215563, 2616383, 55977857, 261298801, 55977857, 2616383, 31465359, 1853983303, 40346506449, 40346506449, 1853983303, 31465359, 363006521, 63763662879, 4545405907875
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OFFSET
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1,1
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COMMENTS
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Table starts
........99.........989.........16089.........215563.......2616383....31465359
.......989.......25929.......1328305.......55977857....1853983303.63763662879
.....16089.....1328305.....261298801....40346506449.4545405907875
....215563....55977857...40346506449.22503661157680
...2616383..1853983303.4545405907875
..31465359.63763662879
.363006521
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LINKS
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EXAMPLE
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Some solutions for n=1 k=4
..2..2..1..2..1..2....2..2..1..0..1..2....2..2..0..0..1..1....2..2..2..0..0..1
..0..1..0..0..1..1....0..1..0..0..0..1....0..0..0..0..0..1....0..0..0..0..0..1
..1..2..0..0..2..1....2..2..1..2..1..2....2..0..1..2..2..2....1..2..0..2..1..2
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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