|
%I #6 Apr 20 2020 19:50:52
%S 4,108,9284,2817548,3159954052,13377149358556,217602949665911156,
%T 13760950074226562086140,3411379570274317633099847884,
%U 3335382860394625859139269051079788
%N Number of n X n 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three no more than once.
%C Diagonal of A269194.
%e Some solutions for n=3
%e ..0..0..0. .2..2..0. .0..1..0. .2..2..2. .3..3..3. .1..3..2. .0..1..3
%e ..2..0..2. .3..2..0. .0..0..0. .0..0..2. .3..2..2. .1..1..3. .1..3..1
%e ..3..2..0. .3..2..0. .0..0..1. .0..2..0. .0..2..3. .3..3..3. .1..3..3
%Y Cf. A269194.
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 20 2016
| 