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, 0), (1, 0, -1)}.
A148969
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, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =109a(6) =401a(7) =1529a(8) =5933a(9) =23677a(10) =96123a(11) =393067a(12) =1626847a(13) =6802771a(14) =28670115a(15) =121927421a(16) =521950931a(17) =2244471413a(18) =9701621923a(19) =42139999533a(20) =183851179889a(21) =805623893623
External references
- oeis: A148969