A264873 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.
1, 0, 5, 12, 3613, 207424, 68488297, 47123513432, 79332328368931
Offset: 1
Keywords
Examples
Some solutions for n=4 ..1..2.12..4.14...10..2..3..4.14....1..2.12..4.14....1..2..3..4.14 .15..0..8..9..3....6..0..1..9.19....6..0..8..9..3....6..0.17..9.19 .20..5..6..7.24...20..5.22..7..8...20..5.22..7.24...20..5.22..7..8 .16.10.11.19.13...16.17.11.12.13...16.10.11.19.13...16.10.11.12.13 .21.22.23.17.18...21.15.23.24.18...21.15.23.17.18...21.15.23.24.18
Crossrefs
Cf. A264878.
Comments