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, 0, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
A148976
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, 0, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =107a(6) =411a(7) =1553a(8) =6194a(9) =24389a(10) =100612a(11) =412488a(12) =1734453a(13) =7264212a(14) =31092761a(15) =132827500a(16) =575349257a(17) =2489633556a(18) =10903009511a(19) =47736774170a(20) =210767379271a(21) =930722838057
External references
- oeis: A148976