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, 1, 1), (1, -1, 1), (1, 0, -1)}.
A148991
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, 1, 1), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =115a(6) =459a(7) =1811a(8) =7463a(9) =31109a(10) =132832a(11) =571567a(12) =2500163a(13) =11007204a(14) =48984490a(15) =219405461a(16) =989521381a(17) =4489102130a(18) =20470167188a(19) =93784099031a(20) =431525119196
External references
- oeis: A148991