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, 0, 0), (1, -1, 0), (1, 0, 0), (1, 1, -1), (1, 1, 1)}.
A150858
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, 0, 0), (1, -1, 0), (1, 0, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =32a(4) =142a(5) =630a(6) =2890a(7) =13302a(8) =62276a(9) =292766a(10) =1389404a(11) =6615274a(12) =31675542a(13) =152069340a(14) =732818002a(15) =3539103044a(16) =17137709066a(17) =83134827968a(18) =404087736826
External references
- oeis: A150858