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, 0), (-1, 1, 0), (0, 0, 1), (1, 0, 1), (1, 1, -1)}.
A150556
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, 0), (-1, 1, 0), (0, 0, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =105a(5) =444a(6) =1947a(7) =8711a(8) =39591a(9) =182324a(10) =848227a(11) =3976086a(12) =18761532a(13) =89032134a(14) =424423410a(15) =2031081206a(16) =9753336307a(17) =46975045125a(18) =226821209031
External references
- oeis: A150556