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, 0), (-1, -1, 1), (-1, 0, 0), (0, 1, -1), (1, 0, 1)}.
A148920
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, 0), (-1, -1, 1), (-1, 0, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =24a(5) =88a(6) =305a(7) =1029a(8) =3938a(9) =14665a(10) =54616a(11) =213726a(12) =831313a(13) =3249045a(14) =12945664a(15) =51759266a(16) =207770481a(17) =840746951a(18) =3422407054a(19) =13970188945a(20) =57259057513a(21) =235971802709a(22) =974522537282
External references
- oeis: A148920