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A263818 Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having index change (+-,+-) 0,0 0,1 0,2 or 1,0.

%I A263818 #13 Aug 31 2025 13:15:38
%S A263818 32,948,18776,333429,6425985,124854432,2392853088,45898515536,
%T A263818 882504683737,16961728977667,325906704633704,6262921821080860,
%U A263818 120359817883976272,2313001901843303293,44449848853940930817,854215652423448900720,16415908945488548695104,315472929981841479177936
%N A263818 Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having index change (+-,+-) 0,0 0,1 0,2 or 1,0.
%H A263818 R. H. Hardin, <a href="/A263818/b263818.txt">Table of n, a(n) for n = 1..210</a>
%e A263818 Some solutions for n=3:
%e A263818 ..2..3..0..1....0..1..2..7....1..3..6..7....1..3..6..2....2..0..1..3
%e A263818 ..6..7..5.11....4..5.10..3....0..5..2.11....0..9..7..5....4..6..7..5
%e A263818 ..4..9..8.10....8.11..6..9....4.10..8..9....4.11..8.10....8.10..9.11
%Y A263818 Row 2 of A263816.
%K A263818 nonn,changed
%O A263818 1,1
%A A263818 _R. H. Hardin_, Oct 27 2015