login
Number of n X n 0..1 arrays with each 1 adjacent to 2 or 3 king-move neighboring 1's.
0

%I #6 Apr 26 2020 20:56:12

%S 1,6,44,518,62702,10239175,3710803701,5908904429141,19661826179139454,

%T 159706594064013413371,4070881939232241860985279

%N Number of n X n 0..1 arrays with each 1 adjacent to 2 or 3 king-move neighboring 1's.

%C Diagonal of A295985.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A295985.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 01 2017