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, 0, -1), (0, 1, 1), (1, -1, -1), (1, 1, 1)}.
A150686
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, 0, -1), (0, 1, 1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =26a(4) =116a(5) =454a(6) =2050a(7) =8794a(8) =39660a(9) =178810a(10) =814012a(11) =3754848a(12) =17342124a(13) =80797170a(14) =378229240a(15) =1774813836a(16) =8382841888a(17) =39623699326a(18) =188152522980a(19) =895426882954
External references
- oeis: A150686