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A264020 Number of (5+1)X(n+1) arrays of permutations of 0..n*6+5 with each element having index change +-(.,.) 0,0 1,2 or 2,2.

%I A264020 #6 Nov 10 2015 10:53:30
%S A264020 1,89,7921,269225,9150625,398967250,17394972100,744568640640,
%T A264020 31870270181376,1369690710968448,58865288340403204,
%U A264020 2529832159410757762,108723679696921023361,4672588420041689987741,200812579228092423992521
%N A264020 Number of (5+1)X(n+1) arrays of permutations of 0..n*6+5 with each element having index change +-(.,.) 0,0 1,2 or 2,2.
%C A264020 Row 5 of A264017.
%H A264020 R. H. Hardin, <a href="/A264020/b264020.txt">Table of n, a(n) for n = 1..210</a>
%F A264020 Empirical: a(n) = 43*a(n-1) -a(n-2) +1848*a(n-4) -79464*a(n-5) +1848*a(n-6) -1848*a(n-8) +79464*a(n-9) -1848*a(n-10) +a(n-12) -43*a(n-13) +a(n-14) for n>18
%e A264020 Some solutions for n=3
%e A264020 ..0..1..2..3...10.11..2..3....0..1..2..3....6..1..2..3....6..1..2..3
%e A264020 ..4.15..6..7....4.15..6..7...10..5..6..7....4.11..0..7...10..5..0..7
%e A264020 .14..9.10.11....8.19..0..1...18.19..4.11...18.15.10..5...18.15..4.11
%e A264020 .18.19..8..5...12.23.14..5...12.13.14.15...12.13.14..9...12.13.14..9
%e A264020 .22.23.12.13...22.17.18..9...16.23..8..9...22.23..8.19...22.23..8.19
%e A264020 .20.21.16.17...20.21.16.13...20.21.22.17...20.21.16.17...20.21.16.17
%Y A264020 Cf. A264017.
%K A264020 nonn
%O A264020 1,2
%A A264020 _R. H. Hardin_, Nov 01 2015