Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 with each element having directed index change 0,0 1,1 0,-1 -1,1 or 0,-2.
A264245
Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 with each element having directed index change 0,0 1,1 0,-1 -1,1 or 0,-2.
Terms
- a(0) =2a(1) =8a(2) =21a(3) =57a(4) =164a(5) =460a(6) =1289a(7) =3629a(8) =10202a(9) =28672a(10) =80609a(11) =226609a(12) =637024a(13) =1790792a(14) =5034233a(15) =14152073a(16) =39783914a(17) =111839432a(18) =314399813a(19) =883831849a(20) =2484603092a(21) =6984645780a(22) =19635038321a(23) =55197463509a(24) =155169545554a(25) =436208230272
External references
- oeis: A264245