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, 0, 1), (1, 1, 1)}.
A150954
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, 0, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =35a(4) =157a(5) =692a(6) =3202a(7) =14765a(8) =69421a(9) =327075a(10) =1556529a(11) =7424728a(12) =35618112a(13) =171271800a(14) =826629554a(15) =3997430561a(16) =19380219233a(17) =94113683719a(18) =457897630269
External references
- oeis: A150954