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, 0), (0, -1, 0), (1, 1, -1), (1, 1, 1)}.
A149605
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, 0), (0, -1, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =61a(5) =237a(6) =975a(7) =4065a(8) =17241a(9) =73767a(10) =321065a(11) =1400101a(12) =6189569a(13) =27425379a(14) =122501931a(15) =548994421a(16) =2473297033a(17) =11172777749a(18) =50700588795a(19) =230493478249
External references
- oeis: A149605