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), (0, 0, -1), (0, 1, 1), (1, 0, 0)}.
A150005
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), (0, 0, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =60a(5) =221a(6) =826a(7) =3229a(8) =12841a(9) =51669a(10) =210672a(11) =870069a(12) =3626280a(13) =15209165a(14) =64286104a(15) =273489917a(16) =1169463848a(17) =5022549846a(18) =21673068761a(19) =93901104376a(20) =408200562527
External references
- oeis: A150005