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), (0, 0, 1), (1, -1, 0), (1, 0, -1)}.
A148021
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), (0, 0, 1), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =17a(6) =46a(7) =127a(8) =385a(9) =1138a(10) =3557a(11) =11332a(12) =36949a(13) =122262a(14) =415624a(15) =1427497a(16) =4962532a(17) =17550068a(18) =62626410a(19) =225373569a(20) =821372128a(21) =3016299522a(22) =11145989333a(23) =41593856129a(24) =156190755015a(25) =589476598936
External references
- oeis: A148021