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, 1, 0), (1, -1, -1), (1, 1, 1)}.
A150521
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, 1, 0), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =25a(4) =103a(5) =434a(6) =1905a(7) =8432a(8) =38061a(9) =173344a(10) =797895a(11) =3697881a(12) =17252327a(13) =80904154a(14) =381185731a(15) =1802945397a(16) =8557423359a(17) =40739374492a(18) =194474312933a(19) =930581160957
External references
- oeis: A150521