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), (0, 0, 1), (1, 1, 0)}.
A150122
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), (0, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =68a(5) =250a(6) =924a(7) =3528a(8) =13668a(9) =53584a(10) =213074a(11) =852976a(12) =3447882a(13) =14021322a(14) =57368826a(15) =236006796a(16) =975087356a(17) =4046503078a(18) =16851624666a(19) =70419777860a(20) =295160069720
External references
- oeis: A150122