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, 0), (0, 1, 1), (1, 0, 0)}.
A150004
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, 0), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =60a(5) =221a(6) =826a(7) =3201a(8) =12729a(9) =51321a(10) =208832a(11) =858309a(12) =3572790a(13) =14997447a(14) =63313413a(15) =268659183a(16) =1147269994a(17) =4927336053a(18) =21248061031a(19) =91934267393a(20) =399246195339
External references
- oeis: A150004