Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 0)}.
A148641
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =22a(5) =64a(6) =227a(7) =753a(8) =2736a(9) =9928a(10) =37199a(11) =139507a(12) =533929a(13) =2061554a(14) =8066480a(15) =31752388a(16) =125891976a(17) =502487380a(18) =2019078792a(19) =8156824050a(20) =33106500545a(21) =134918511479a(22) =552142246160
External references
- oeis: A148641