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, 1), (-1, 1, 1), (1, 0, -1), (1, 0, 1)}.
A148766
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, 1), (-1, 1, 1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =29a(5) =89a(6) =357a(7) =1171a(8) =5125a(9) =18575a(10) =79551a(11) =293317a(12) =1315997a(13) =5115957a(14) =22572953a(15) =88184675a(16) =401342669a(17) =1622265697a(18) =7282398181a(19) =29448923819a(20) =135288098867a(21) =560656367587
External references
- oeis: A148766