Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 2,-2 -1,0 -1,2 1,0 or 0,-1.

A264380

Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 2,-2 -1,0 -1,2 1,0 or 0,-1.

Terms

    a(0) =0a(1) =1a(2) =6a(3) =9a(4) =61a(5) =121a(6) =544a(7) =1357a(8) =5100a(9) =14340a(10) =49324a(11) =147230a(12) =485141a(13) =1491460a(14) =4812843a(15) =15012153a(16) =47950974a(17) =150636184a(18) =478755674a(19) =1509249756a(20) =4785018013a(21) =15110309428a(22) =47849311565a(23) =151226992088a(24) =478604645313

External references