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, 0), (-1, 0, 0), (1, 0, -1), (1, 1, 1)}.
A149543
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, 0), (-1, 0, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =55a(5) =183a(6) =797a(7) =2857a(8) =12745a(9) =48137a(10) =217181a(11) =848805a(12) =3864969a(13) =15476641a(14) =70950761a(15) =289401315a(16) =1333805235a(17) =5519509311a(18) =25548231703a(19) =106962811299a(20) =496860515253
External references
- oeis: A149543