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, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, -1)}.
A148621
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, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =59a(6) =215a(7) =687a(8) =2674a(9) =9218a(10) =36708a(11) =134191a(12) =548938a(13) =2074773a(14) =8638690a(15) =33714423a(16) =142274466a(17) =566710795a(18) =2422552226a(19) =9835927336a(20) =42399780851a(21) =174675742734a(22) =759821784189
External references
- oeis: A148621