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, 0), (-1, 0, 1), (1, 0, -1), (1, 1, 1)}.
A149561
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, 0), (-1, 0, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =59a(5) =197a(6) =893a(7) =3303a(8) =15137a(9) =59095a(10) =273663a(11) =1105191a(12) =5159271a(13) =21336649a(14) =100195667a(15) =421818947a(16) =1989617133a(17) =8493738751a(18) =40199221659a(19) =173546936539a(20) =823571270199
External references
- oeis: A149561