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A263974 Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having index change (+-,+-) 0,2 1,1 or 1,0.

%I A263974 #8 Nov 10 2015 10:31:14
%S A263974 0,72,1817,10720,89472,1791696,27783305,317382472,3783068416,
%T A263974 51756812704,698792225489,8925688199152,114042394336256,
%U A263974 1490898399253328,19518200132035505,253177516072868896,3279883039710140160
%N A263974 Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having index change (+-,+-) 0,2 1,1 or 1,0.
%C A263974 Row 2 of A263973.
%H A263974 R. H. Hardin, <a href="/A263974/b263974.txt">Table of n, a(n) for n = 1..210</a>
%e A263974 Some solutions for n=4
%e A263974 ..5..3..4..1..9....2..6..4..1..9....6..3..8..9..2....6..5..0..8..2
%e A263974 ..7..0.12..2.14...10..0..3.14..7....0..1.11..4.14...10.11..1..3..4
%e A263974 ..6.13.10.11..8....5.13..8.11.12....5.13.10..7.12...12.13.14..7..9
%Y A263974 Cf. A263973.
%K A263974 nonn
%O A263974 1,2
%A A263974 _R. H. Hardin_, Oct 30 2015