A298655 - OEIS

%I #6 Jun 15 2020 11:22:42

%S 0,3,15,40,177,1116,7964,89543,1367704,32451809,1028816587

%N Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

%C Diagonal of A298660.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A298660.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 24 2018