login
Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0

%I #6 Jun 15 2020 14:47:52

%S 0,1,9,130,21367,7242300,9743385598,43313516068423,635719287829223338

%N Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A299602.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A299602.

%K nonn

%O 1,3

%A _R. H. Hardin_, Feb 14 2018