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, 1), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
A150003
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, 1), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =60a(5) =216a(6) =846a(7) =3378a(8) =13471a(9) =55966a(10) =235362a(11) =985219a(12) =4229588a(13) =18306710a(14) =78859172a(15) =345683311a(16) =1524069221a(17) =6691150026a(18) =29757260250a(19) =132901102923a(20) =591431979600
External references
- oeis: A150003