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, 1), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
A149897
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, 1), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =46a(5) =162a(6) =595a(7) =2261a(8) =8841a(9) =35340a(10) =143811a(11) =594390a(12) =2488519a(13) =10533645a(14) =45014997a(15) =193970548a(16) =841930778a(17) =3678034790a(18) =16160393595a(19) =71371290127a(20) =316672410576
External references
- oeis: A149897