login

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

Number of nX7 0..n*7-1 arrays with upper left zero and lower right n*7-1 and each element differing from its horizontal, vertical and diagonal neighbors by a power of two.
0

%I #3 Dec 09 2015 13:52:54

%S 456,1030,294152,595253,949287922,223328748,316185648156135,

%T 121504746202,15215491198062021,145636281907673112

%N Number of nX7 0..n*7-1 arrays with upper left zero and lower right n*7-1 and each element differing from its horizontal, vertical and diagonal neighbors by a power of two.

%C Column 7 of A265494.

%e Some solutions for n=2

%e ..0..4..5..9.10.11..9....0..4..5..9.13.11..9....0..4..5..3..7..5..9

%e ..4..2..3..7.11.12.13....4..8..6..7.11..9.13....1..2..3..7.11..9.13

%Y Cf. A265494.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 09 2015