A204727 - OEIS

%I #9 Oct 03 2025 11:26:48

%S 4772,44726,264998,2122560,14348560,108530190,763490340,5669180550,

%T 40529890856,299152763686,2156365512882,15887979228428,

%U 115125216329402,847992795375562,6168535964532854,45448892886236444,331648100487513774

%N Number of (n+1)X4 0..4 arrays with the permanents of all 2X2 subblocks equal and nonzero.

%C Column 3 of A204732

%H R. H. Hardin, <a href="/A204727/b204727.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..4..3..4..3....3..2..0..2....3..0..3..2....4..0..4..0....4..1..2..1

%e ..0..1..0..1....4..0..4..3....1..2..0..2....4..1..1..1....0..1..2..1

%e ..4..4..4..3....3..2..0..2....1..4..3..0....4..0..4..0....4..1..2..1

%e ..0..1..0..1....1..2..4..1....1..2..0..2....3..1..2..1....4..0..4..0

%e ..4..3..4..2....3..2..0..2....1..4..3..3....4..0..4..0....2..1..3..1

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 18 2012