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, 1, 1), (1, -1, 1), (1, 0, -1)}.
A149036
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, 1, 1), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =35a(5) =126a(6) =495a(7) =1973a(8) =8009a(9) =33248a(10) =139542a(11) =592995a(12) =2548398a(13) =11028950a(14) =48080272a(15) =210957689a(16) =930544023a(17) =4125086990a(18) =18365051708a(19) =82072860679a(20) =368080787422
External references
- oeis: A149036