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, 0, 0), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
A150062
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, 0, 0), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =63a(5) =223a(6) =850a(7) =3280a(8) =13162a(9) =53421a(10) =221716a(11) =929697a(12) =3952869a(13) =16954033a(14) =73403606a(15) =320088805a(16) =1405405599a(17) =6206513462a(18) =27554351874a(19) =122904959481a(20) =550538683547
External references
- oeis: A150062