A297944 - OEIS

%I #6 May 03 2020 15:40:47

%S 0,4,56,948,23840,938557,53630550,4667940027,616122541550

%N Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.

%C Diagonal of A297951.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A297951.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 09 2018