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

A264585

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

Terms

    a(0) =1a(1) =2a(2) =4a(3) =10a(4) =16a(5) =56a(6) =128a(7) =320a(8) =784a(9) =1792a(10) =4480a(11) =10496a(12) =25600a(13) =62080a(14) =149504a(15) =363520a(16) =872448a(17) =2109440a(18) =5088256a(19) =12279808a(20) =29683712a(21) =71622656a(22) =173031424a(23) =417669120a(24) =1008336896a(25) =2434695168a(26) =5877530624a(27) =14192476160a(28) =34265432064a(29) =82732646400

External references