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, 0), (-1, -1, 1), (-1, 0, -1), (0, 1, -1), (1, 0, 1)}.
A148681
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, 0), (-1, -1, 1), (-1, 0, -1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =22a(5) =66a(6) =227a(7) =748a(8) =2710a(9) =9643a(10) =35646a(11) =133338a(12) =506112a(13) =1938692a(14) =7546335a(15) =29463016a(16) =116453080a(17) =462871956a(18) =1851092051a(19) =7451911578a(20) =30144766089a(21) =122486787548a(22) =500198189286
External references
- oeis: A148681