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, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 0)}.
A148874
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, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =29a(5) =97a(6) =356a(7) =1345a(8) =5312a(9) =20951a(10) =84910a(11) =349614a(12) =1456834a(13) =6106706a(14) =25935852a(15) =111040569a(16) =477930029a(17) =2069560858a(18) =9025183157a(19) =39530097395a(20) =173797714040a(21) =767680927436
External references
- oeis: A148874