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), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
A148574
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), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =49a(6) =172a(7) =484a(8) =1732a(9) =5194a(10) =19061a(11) =59840a(12) =222265a(13) =722995a(14) =2707778a(15) =9031024a(16) =34126550a(17) =116009638a(18) =440855651a(19) =1523827413a(20) =5816083375a(21) =20364473133a(22) =78075605101a(23) =276294402102
External references
- oeis: A148574