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, 1), (-1, 1, 1), (0, -1, 1), (1, 0, 0), (1, 1, -1)}.
A148902
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, 1), (-1, 1, 1), (0, -1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =31a(5) =114a(6) =475a(7) =1987a(8) =8682a(9) =38428a(10) =173636a(11) =792939a(12) =3663783a(13) =17065149a(14) =80076371a(15) =377979137a(16) =1793374394a(17) =8545969754a(18) =40879106065a(19) =196184628494a(20) =944237293800
External references
- oeis: A148902