A298713 - OEIS

%I #6 Jun 15 2020 11:24:06

%S 0,1,4,59,3508,563977,193439202,177476979652,405759343397572

%N Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

%C Diagonal of A298719.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A298719.

%K nonn

%O 1,3

%A _R. H. Hardin_, Jan 25 2018