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R. H. Hardin, <a href="/A268808/a268808.txt">Empirical recurrence of order 68</a>
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R. H. Hardin, <a href="/A268808/b268808.txt">Table of n, a(n) for n = 1..210</a>
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Number of nX7 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.
768, 4914, 48460, 640926, 8734264, 115671422, 1508087180, 19390335102, 246666802206, 3110082281974, 38924665296474, 484120668061458, 5988867204857378, 73740656947715536, 904257358969806890
1,1
Column 7 of A268809.
Empirical recurrence of order 68 (see link above)
Some solutions for n=3
..2..2..2..2..2..1..2. .0..0..0..1..0..0..0. .0..0..1..0..1..0..0
..2..2..2..2..2..2..1. .0..0..0..0..1..0..1. .1..0..0..1..0..0..1
..1..2..1..2..1..0..0. .0..1..0..0..0..0..1. .0..1..0..0..1..0..0
Cf. A268809.
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nonn
R. H. Hardin, Feb 13 2016
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