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), (0, 0, 1), (0, 1, 1), (1, 0, 1), (1, 1, -1)}.
A151181
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), (0, 0, 1), (0, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =50a(4) =230a(5) =1059a(6) =5043a(7) =24073a(8) =116650a(9) =566294a(10) =2770564a(11) =13575457a(12) =66809023a(13) =329196128a(14) =1626369177a(15) =8042962723a(16) =39842574055a(17) =197525771175a(18) =980382103175
External references
- oeis: A151181