Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.
A264515
Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =36a(4) =144a(5) =576a(6) =2116a(7) =8281a(8) =31329a(9) =121801a(10) =467856a(11) =1809025a(12) =6969600a(13) =26884225a(14) =103632400a(15) =399560121a(16) =1540484001a(17) =5939322489a(18) =22899558276a(19) =88289802496a(20) =340406901136
External references
- oeis: A264515