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

A264629

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

Terms

    a(0) =1a(1) =2a(2) =4a(3) =9a(4) =16a(5) =37a(6) =76a(7) =160a(8) =337a(9) =704a(10) =1485a(11) =3110a(12) =6532a(13) =13713a(14) =28784a(15) =60441a(16) =126872a(17) =266368a(18) =559201a(19) =1173968a(20) =2464617a(21) =5174122a(22) =10862468a(23) =22804377a(24) =47874976a(25) =100507613a(26) =211003236a(27) =442975264a(28) =929971633a(29) =1952360368

External references