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A300638 Number of nX7 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1

%I #4 Mar 10 2018 10:31:28

%S 8,223,705,3313,17607,124439,865205,6105466,44264248,319622847,

%T 2311191759,16797467849,122107007666,887949403002,6461637480954,

%U 47018596903063,342127968993605,2489544665981657,18115122148301327

%N Number of nX7 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 7 of A300639.

%H R. H. Hardin, <a href="/A300638/b300638.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A300639.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 10 2018

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)