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, 0, 0), (-1, 0, 1), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
A148486
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, 0, 0), (-1, 0, 1), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =71a(6) =260a(7) =1000a(8) =3953a(9) =15917a(10) =65410a(11) =273438a(12) =1157570a(13) =4949533a(14) =21375685a(15) =93089976a(16) =408147676a(17) =1800678253a(18) =7989131978a(19) =35618243432a(20) =159490955535a(21) =717004472555
External references
- oeis: A148486