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 A265596 Number of nX3 0..n*3-1 arrays with upper left zero and lower right n*3-1 and each element differing from its horizontal, vertical and antidiagonal neighbors by a power of two. 1

%I

%S 1,4,0,177,2228,0,534268,1808623,0,221771015,9350721457,0,

%T 1164230050591,8981789416609,0,1113779465888434,35768924074919695,0,

%U 6116073611940463518,38407633854606693981,0,8985586499215136905778

%N Number of nX3 0..n*3-1 arrays with upper left zero and lower right n*3-1 and each element differing from its horizontal, vertical and antidiagonal neighbors by a power of two.

%C Column 3 of A265601.

%H R. H. Hardin, <a href="/A265596/b265596.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

%e ..0..2..1....0..2.10....0..8..7....0..8.10....0..2..1....0..2..4....0..8..4

%e ..4..3..5....4..6..2....4..6..8....4.12.11....4..0..2....4..0..8....4..0..8

%e ..5..7..6....8.10..6....8.10..9....8.10.12....8..4..6....2..4.12....8..4..6

%e ..6..8.10...12.14.10....6..8.10...12..8.10....6..8.10....0..8.10...12..8.10

%e ..4.12.14...10..6.14....7..6.14...10..6.14...10.12.14....4..6.14....4..6.14

%Y Cf. A265601.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 10 2015

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Last modified May 31 19:40 EDT 2020. Contains 334748 sequences. (Running on oeis4.)