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, 0), (-1, -1, 1), (0, 0, -1), (0, 1, -1), (1, 1, 0)}.
A148674
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, 0), (-1, -1, 1), (0, 0, -1), (0, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =65a(6) =205a(7) =693a(8) =2359a(9) =8239a(10) =29515a(11) =106499a(12) =391467a(13) =1455087a(14) =5452595a(15) =20672471a(16) =78900633a(17) =303359513a(18) =1175020613a(19) =4574684005a(20) =17916257965a(21) =70522908505a(22) =278795140965
External references
- oeis: A148674