Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.
A264521
Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =42a(4) =196a(5) =644a(6) =2116a(7) =6854a(8) =22201a(9) =78076a(10) =274576a(11) =937960a(12) =3204100a(13) =10890360a(14) =37015056a(15) =126620208a(16) =433139344a(17) =1480295124a(18) =5059050129a(19) =17273618712a(20) =58979036736a(21) =201463380504a(22) =688168134481
External references
- oeis: A264521