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), (-1, 1, 0), (1, -1, -1), (1, 1, 1)}.
A149554
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), (-1, 1, 0), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =59a(5) =187a(6) =883a(7) =3169a(8) =14959a(9) =56465a(10) =270401a(11) =1067643a(12) =5138107a(13) =20768155a(14) =100531397a(15) =415371639a(16) =2018477663a(17) =8463235109a(18) =41253849485a(19) =175193128703a(20) =856236442631
External references
- oeis: A149554