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

A264491

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

Terms

    a(0) =3a(1) =1a(2) =10a(3) =8a(4) =35a(5) =42a(6) =130a(7) =194a(8) =501a(9) =849a(10) =1979a(11) =3613a(12) =7942a(13) =15145a(14) =32182a(15) =62953a(16) =131165a(17) =260426a(18) =536438a(19) =1074379a(20) =2198378a(21) =4425274a(22) =9019904a(23) =18210519a(24) =37034259a(25) =74898261a(26) =152118445a(27) =307953916a(28) =624975597a(29) =1265962640

External references