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, -1), (0, 0, -1), (0, 1, 1), (1, -1, 1)}.
A148851
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, -1), (0, 0, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =91a(6) =339a(7) =1219a(8) =4701a(9) =17939a(10) =71573a(11) =284089a(12) =1157733a(13) =4721259a(14) =19569779a(15) =81402649a(16) =342160546a(17) =1445001223a(18) =6145007988a(19) =26261712426a(20) =112789021222a(21) =486638853729
External references
- oeis: A148851