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, 0), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
A148959
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, 0), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =100a(6) =370a(7) =1372a(8) =5290a(9) =20266a(10) =80361a(11) =321735a(12) =1307984a(13) =5335667a(14) =22024808a(15) =91659114a(16) =384509857a(17) =1620023737a(18) =6864307125a(19) =29248903041a(20) =125269708719a(21) =538502958487
External references
- oeis: A148959