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, 0, 1), (0, 1, 0), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
A150221
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, 0, 1), (0, 1, 0), (1, -1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =83a(5) =349a(6) =1528a(7) =6885a(8) =31663a(9) =147881a(10) =698854a(11) =3333119a(12) =16013223a(13) =77383680a(14) =375742768a(15) =1831622869a(16) =8957731740a(17) =43928634211a(18) =215923994375
External references
- oeis: A150221