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, 1), (1, -1, 1), (1, 0, 0)}.
A150018
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, 1), (1, -1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =18a(4) =66a(5) =250a(6) =998a(7) =3982a(8) =16425a(9) =68994a(10) =291590a(11) =1249283a(12) =5379960a(13) =23386285a(14) =102427127a(15) =450537920a(16) =1993129805a(17) =8847528372a(18) =39457918817a(19) =176666431300a(20) =793212617598
External references
- oeis: A150018