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A298884 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero. 0

%I

%S 0,3,15,40,123,516,1818,7768,41048,242083,1483959,10171555

%N Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A298888.

%e Some solutions for n=7

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

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

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

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

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

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

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

%Y Cf. A298888.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 28 2018

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Last modified January 21 03:58 EST 2022. Contains 350473 sequences. (Running on oeis4.)