A304127 - OEIS

%I #6 Sep 16 2020 19:11:17

%S 1,5,9,44,176,651,2945,14708,79188,495071,3628565,29134749,265855219,

%T 2732640025,30998016185,398665350465

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

%C Diagonal of A304133.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304133.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 07 2018