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A268892 Number of 7Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once. 1

%I

%S 0,2285,60666,1706732,39670270,911930096,19876401224,426591159751,

%T 8952723005030,185650834624156,3802871585155968,77225962585267472,

%U 1555913690406127580,31149964203775581289,620153220846869863058

%N Number of 7Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.

%C Row 7 of A268886.

%H R. H. Hardin, <a href="/A268892/b268892.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A268892/a268892.txt">Empirical recurrence of order 68</a>

%F Empirical recurrence of order 68 (see link above)

%e Some solutions for n=3

%e ..1..0..0. .0..1..1. .1..0..0. .0..0..1. .0..1..0. .0..0..0. .0..0..1

%e ..0..0..1. .0..0..0. .1..1..0. .1..0..0. .0..1..0. .0..0..1. .1..0..0

%e ..1..0..0. .1..0..1. .0..0..1. .0..0..0. .1..0..1. .1..0..1. .1..0..0

%e ..1..0..0. .1..0..1. .1..0..0. .0..0..0. .1..0..0. .0..0..1. .0..1..0

%e ..0..1..0. .0..0..0. .1..0..1. .0..1..1. .1..0..0. .0..1..0. .0..1..0

%e ..1..0..0. .1..0..1. .0..0..1. .0..0..0. .1..0..1. .0..1..0. .1..0..1

%e ..1..0..0. .0..0..1. .0..0..0. .0..1..0. .0..0..0. .0..0..1. .0..0..0

%Y Cf. A268886.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 15 2016

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Last modified July 31 02:33 EDT 2021. Contains 346367 sequences. (Running on oeis4.)