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A264627 Number of (n+1)X(7+1) arrays of permutations of 0..n*8+7 with each element having directed index change -2,0 -1,0 0,-1 or 1,1. 1

%I #4 Nov 19 2015 06:55:54

%S 0,76,1200,13556,349391,7907841,145801320,2739867178,54011094032,

%T 1041910674136,19735900374844,375966942137013,7191151172715700,

%U 137027122103977880,2605652234584032150,49595770201824007656

%N Number of (n+1)X(7+1) arrays of permutations of 0..n*8+7 with each element having directed index change -2,0 -1,0 0,-1 or 1,1.

%C Column 7 of A264628.

%H R. H. Hardin, <a href="/A264627/b264627.txt">Table of n, a(n) for n = 1..27</a>

%e Some solutions for n=4

%e .16.17..3.11.12..6..7.15....1.17..3.11.12..6..7.15....1..2..3..4..5..6..7.23

%e ..9..0..1..2.28..4..5.23...24..0.26..2.13..4..5.31....9..0.26.27.13.14.15.31

%e .32..8.34.10.21.22.13.14...32..8..9.10.28.29.23.14...32..8.34.10.11.12.38.39

%e .25.26.27.18.19.20.31.39...25.16.27.18.19.20.21.22...25.16.17.18.19.20.21.22

%e .33.24.35.36.37.38.29.30...33.34.35.36.37.38.39.30...33.24.35.36.37.28.29.30

%Y Cf. A264628.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 19 2015

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