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, -1)}.
A150076
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, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =66a(5) =237a(6) =910a(7) =3544a(8) =14316a(9) =57988a(10) =240037a(11) =1004974a(12) =4250588a(13) =18089218a(14) =77781528a(15) =336565989a(16) =1463454865a(17) =6397975200a(18) =28130673287a(19) =124136439392a(20) =549725055665
External references
- oeis: A150076