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%I #4 Nov 27 2015 07:30:13
%S 1,0,5,12,3613,207424,68488297,47123513432,79332328368931
%N Number of (n+1)X(n+1) arrays of permutations of 0..(n+1)^2-1 with each element having directed index change 0,1 0,-1 -2,0 or 1,1.
%C Diagonal of A264878.
%e Some solutions for n=4
%e ..1..2.12..4.14...10..2..3..4.14....1..2.12..4.14....1..2..3..4.14
%e .15..0..8..9..3....6..0..1..9.19....6..0..8..9..3....6..0.17..9.19
%e .20..5..6..7.24...20..5.22..7..8...20..5.22..7.24...20..5.22..7..8
%e .16.10.11.19.13...16.17.11.12.13...16.10.11.19.13...16.10.11.12.13
%e .21.22.23.17.18...21.15.23.24.18...21.15.23.17.18...21.15.23.24.18
%Y Cf. A264878.
%K nonn
%O 1,3
%A _R. H. Hardin_, Nov 27 2015
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