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, 1, 1), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
A148728
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, 1, 1), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =72a(6) =278a(7) =918a(8) =3678a(9) =13040a(10) =53884a(11) =200694a(12) =845723a(13) =3266873a(14) =13972607a(15) =55450557a(16) =240031808a(17) =972983451a(18) =4251703434a(19) =17532731134a(20) =77217505713a(21) =322913991532
External references
- oeis: A148728