Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,1 2,2 1,0 -1,2 -2,-1 or -1,-1.
A264423
Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,1 2,2 1,0 -1,2 -2,-1 or -1,-1.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =37a(4) =119a(5) =385a(6) =1252a(7) =4061a(8) =13166a(9) =42687a(10) =138419a(11) =448847a(12) =1455443a(13) =4719435a(14) =15303308a(15) =49622768a(16) =160907641a(17) =521761825a(18) =1691873630a(19) =5486097814a(20) =17789312907a(21) =57683924784a(22) =187046863084a(23) =606521298870
External references
- oeis: A264423