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, 0, -1), (1, 1, 1)}.
A149551
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, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =57a(5) =191a(6) =849a(7) =3133a(8) =14149a(9) =54985a(10) =251685a(11) =1011503a(12) =4674197a(13) =19248263a(14) =89544717a(15) =375543783a(16) =1756059813a(17) =7469472419a(18) =35073265951a(19) =150881670271a(20) =710878991207
External references
- oeis: A149551