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, 0, 0), (0, -1, 0), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.
A150551
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, 0, 0), (0, -1, 0), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =105a(5) =442a(6) =1916a(7) =8488a(8) =38235a(9) =174485a(10) =804462a(11) =3740400a(12) =17513605a(13) =82489616a(14) =390484340a(15) =1856451123a(16) =8859167234a(17) =42415983949a(18) =203668542147a(19) =980467452300
External references
- oeis: A150551