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A301614 Number of nX7 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero. 1

%I #4 Mar 24 2018 11:41:56

%S 8,1172,72758,4422826,271301458,16632517333,1019565752074,

%T 62500458737127,3831336753439723,234864521959895889,

%U 14397413152054371201,882574864133207632568,54102660842288578973363,3316543531108585833444946

%N Number of nX7 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

%C Column 7 of A301615.

%H R. H. Hardin, <a href="/A301614/b301614.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A301615.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 24 2018

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Last modified April 24 13:58 EDT 2024. Contains 371960 sequences. (Running on oeis4.)