Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change -1,-1 1,0 -1,-2 -2,-2 or 0,1.
A264677
Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change -1,-1 1,0 -1,-2 -2,-2 or 0,1.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =29a(4) =75a(5) =201a(6) =588a(7) =1700a(8) =4785a(9) =13401a(10) =37905a(11) =107598a(12) =304638a(13) =860789a(14) =2433555a(15) =6885713a(16) =19483112a(17) =55110392a(18) =155875521a(19) =440924465a(20) =1247301569a(21) =3528321578a(22) =9980556450a(23) =28232081677a(24) =79861067099a(25) =225905953689a(26) =639026458132
External references
- oeis: A264677