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%I #4 Nov 12 2015 07:54:51
%S 1,1,80,3778,1742881,2546661201,16353452350876,411980921235969243
%N Number of (n+1)X(n+1) arrays of permutations of 0..(n+1)^2-1 with each element having directed index change 2,-2 -1,0 -1,2 1,0 or 0,-1.
%C Diagonal of A264379.
%e Some solutions for n=4
%e ..5..2..3..4..7....1..2..5..6..9....1..2..5..8..9....1..6..5..8..9
%e ..0..1.10.11.12....0..7.10..3..4....0..7.10..3.12....0..7.10..3..4
%e .15..6.13.18..9...15.12.13..8.17...11..6..4.14.17....2.16.15.18.17
%e .16..8.20.23.14...20.11.18.23.22...16.21.20.13.24...20.11.12.13.14
%e .21.22.17.24.19...21.16.14.24.19...15.22.23.18.19...21.22.23.24.19
%Y Cf. A264379.
%K nonn
%O 1,3
%A _R. H. Hardin_, Nov 12 2015