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A318424 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0

%I #4 Aug 26 2018 11:20:24

%S 0,5,36,889,19645,1216538,99435165,16560787736,4592429086849,

%T 2333365855609501,2101260262723993958

%N Number of nXn 0..1 arrays with every element unequal to 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Diagonal of A318430.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A318430.

%K nonn

%O 1,2

%A _R. H. Hardin_, Aug 26 2018

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)