cp's OEIS Frontend

A206247 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having zero permanent.

%I A206247 #8 Jul 22 2025 19:20:46
%S A206247 49,8029,1364224,4556324929,14139111560401,848170637644693504,
%T A206247 48673249000646115009649,50198078741005740094898080285,
%U A206247 52964434709981480280861081128206336
%N A206247 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having zero permanent.
%C A206247 Diagonal of A206255
%H A206247 R. H. Hardin, <a href="/A206247/b206247.txt">Table of n, a(n) for n = 1..17</a>
%e A206247 Some solutions for n=4
%e A206247 ..3..3..0..1..0....1..2..3..2..2....3..3..2..1..3....0..0..3..1..3
%e A206247 ..0..0..0..1..0....0..0..0..0..0....0..0..0..0..0....3..0..0..0..0
%e A206247 ..3..2..0..3..0....2..1..3..2..1....1..0..2..0..1....2..0..3..0..1
%e A206247 ..0..0..0..1..0....0..0..0..0..0....1..0..1..0..2....3..0..0..0..3
%e A206247 ..2..3..0..1..0....1..0..3..3..3....2..0..1..0..3....3..0..3..0..0
%K A206247 nonn
%O A206247 1,1
%A A206247 _R. H. Hardin_ Feb 05 2012