A306123 - OEIS

%I #4 Jun 22 2018 07:32:06

%S 1,5,9,70,517,4872,143839,8721531,902758342,197546692104

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

%C Diagonal of A306129.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A306129.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jun 22 2018