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A264487 Number of (n+1) X (4+1) arrays of permutations of 0..n*5+4 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.

%I A264487 #8 May 04 2024 12:30:19
%S A264487 1,8,108,788,21466,142352,2870927,30309632,463508815,5517128232,
%T A264487 80746395988,996650042932,14098841570856,180039273539208,
%U A264487 2481030453759277,32286677930222166,438951446059251344
%N A264487 Number of (n+1) X (4+1) arrays of permutations of 0..n*5+4 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.
%C A264487 Column 4 of A264490.
%H A264487 R. H. Hardin, <a href="/A264487/b264487.txt">Table of n, a(n) for n = 1..138</a>
%e A264487 Some solutions for n=4
%e A264487 .12..6..7..4..9....5..6..7..4..9....5..6..7..8..9....5..6..7..8..9
%e A264487 ..0..1..2..3.14....0.18.12.13.14...10..1.12.13..4...10.11..2..3..4
%e A264487 ..5.16.17.18.19...15.16..1..2..3...11..0.24..2..3...22..0..1.18.19
%e A264487 .20.21.22.23..8...20.11.22.23..8...20.21.22.23.14...20.21.12.23.14
%e A264487 .15.10.11.24.13...21.10.17.24.19...15.16.17.18.19...15.16.17.24.13
%Y A264487 Cf. A264490.
%K A264487 nonn
%O A264487 1,2
%A A264487 _R. H. Hardin_, Nov 14 2015