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Number of nX7 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1

%I #4 Mar 10 2018 10:39:56

%S 0,41,340,9738,268615,7455411,209156119,5850560104,164070075524,

%T 4598093771759,128918622840447,3614049889811873,101322289968443168,

%U 2840562813679842551,79635815085572716192,2232600346263905624578

%N Number of nX7 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 7 of A300646.

%H R. H. Hardin, <a href="/A300645/b300645.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A300646.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 10 2018