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, 1), (-1, 1, 1), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
A148490
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, 1), (-1, 1, 1), (0, 1, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =75a(6) =284a(7) =1109a(8) =4470a(9) =18453a(10) =77433a(11) =329126a(12) =1415834a(13) =6149299a(14) =26931302a(15) =118780241a(16) =527010199a(17) =2350740211a(18) =10534962936a(19) =47408681317a(20) =214136796301a(21) =970426128408
External references
- oeis: A148490