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), (0, 0, -1), (0, 0, 1), (1, 0, -1)}.
A148557
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), (0, 0, -1), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =18a(5) =47a(6) =146a(7) =447a(8) =1466a(9) =4942a(10) =16980a(11) =60336a(12) =215195a(13) =789272a(14) =2907758a(15) =10919990a(16) =41340269a(17) =158282738a(18) =612024510a(19) =2382090777a(20) =9361524557a(21) =36969568871a(22) =147194884001a(23) =588824950464
External references
- oeis: A148557