login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

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

%I #6 Sep 16 2020 19:06:58

%S 1,5,9,28,76,177,367,774,1684,3639,7597,15617,32101,66074,135096,

%T 274104,553668,1116275,2245277,4501938,9000074,17953486,35749382,

%U 71056212,140977366,279246077,552333115,1091040731

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

%C Diagonal of A303682.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A303682.

%K nonn

%O 1,2

%A _R. H. Hardin_, Apr 28 2018