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, -1, 1), (-1, 0, 0), (1, -1, -1), (1, 1, 0)}.
A148540
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, -1, 1), (-1, 0, 0), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =19a(5) =45a(6) =167a(7) =443a(8) =1687a(9) =5081a(10) =19851a(11) =61949a(12) =242911a(13) =795239a(14) =3205607a(15) =10806745a(16) =43543547a(17) =149722163a(18) =611995035a(19) =2158558103a(20) =8864811287a(21) =31612799289a(22) =130436796397a(23) =473156526527
External references
- oeis: A148540