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), (-1, 0, 0), (0, 0, 1), (1, 1, -1)}.
A148443
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), (-1, 0, 0), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =16a(5) =47a(6) =157a(7) =507a(8) =1714a(9) =6074a(10) =21360a(11) =77241a(12) =284811a(13) =1051900a(14) =3954103a(15) =15003471a(16) =57201331a(17) =220534963a(18) =855038657a(19) =3332650936a(20) =13084082094a(21) =51582007825a(22) =204327262149a(23) =813393343533
External references
- oeis: A148443