cp's OEIS Frontend

A264636 Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 4.

%I A264636 #3 Nov 19 2015 07:27:12
%S A264636 1,3,16,128,1152,12960,269568,6635520,165888000,4561920000,
%T A264636 209018880000,10480803840000,513559388160000,26454892584960000,
%U A264636 2106067546275840000
%N A264636 Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 4.
%C A264636 Column 2 of A264638.
%e A264636 Some solutions for n=4
%e A264636 ..4..0....0..1....0..4....0..2....4..1....4..0....4..0....0..5....0..1....4..0
%e A264636 ..2..1....4..5....1..5....4..6....0..6....2..5....5..1....4..1....4..5....1..5
%e A264636 ..6..5....2..7....2..6....5..3....5..7....6..1....2..6....6..2....6..2....2..3
%e A264636 ..3..7....6..3....3..7....1..7....2..3....7..3....3..7....3..7....3..7....6..7
%Y A264636 Cf. A264638.
%K A264636 nonn
%O A264636 1,2
%A A264636 _R. H. Hardin_, Nov 19 2015