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, 0), (0, 0, -1), (1, 0, 1)}.
A148668
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, 0), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =19a(5) =60a(6) =185a(7) =555a(8) =1841a(9) =5956a(10) =19505a(11) =66820a(12) =225634a(13) =756816a(14) =2642845a(15) =9115115a(16) =31500557a(17) =111381604a(18) =390731927a(19) =1366403748a(20) =4883389422a(21) =17318135888a(22) =61435889157a(23) =221076079788a(24) =791460173438
External references
- oeis: A148668