A265621 - OEIS

A265621

Number of 3 X n 0..3*n-1 arrays with upper left zero and lower right 3*n-1 and each element differing from its horizontal and diagonal neighbors by a power of two.

%I #6 Apr 17 2022 21:28:02

%S 3,45,5625,392320,13534874,3413887598,1130198405370,53578062122213,

%T 13108218265241141,992125896408438521,244355616796007755084,

%U 26142858782722268963104,5253247467346100142679906

%N Number of 3 X n 0..3*n-1 arrays with upper left zero and lower right 3*n-1 and each element differing from its horizontal and diagonal neighbors by a power of two.

%C Row 3 of A265619.

%H R. H. Hardin, <a href="/A265621/b265621.txt">Table of n, a(n) for n = 1..33</a>

%e Some solutions for n=3

%e ..0..1..3....0..2..1....0..4..5....0..2..3....0..4..3....0..4..3....0..8..7

%e ..2..4..3....2..4..6....6..4..5....3..4..3....0..4..2....2..4..5....8..4..6

%e ..5..6..8....2..0..8....8..7..8....3..4..8....5..4..8....8..4..8....5..7..8

%Y Cf. A265619.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 10 2015