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, -1, 1), (-1, 0, 1), (1, 1, 0)}.
A149089
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, -1, 1), (-1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =7a(4) =32a(5) =68a(6) =320a(7) =747a(8) =3588a(9) =8884a(10) =43112a(11) =111054a(12) =542840a(13) =1439280a(14) =7068896a(15) =19157363a(16) =94420380a(17) =260343268a(18) =1286463464a(19) =3596962122a(20) =17809428792a(21) =50372422384a(22) =249792782560a(23) =713390782142
External references
- oeis: A149089