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, 0, -1), (0, -1, 0), (0, 0, -1), (1, 1, 1)}.
A149578
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, 0, -1), (0, -1, 0), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =51a(5) =211a(6) =795a(7) =3057a(8) =13001a(9) =52581a(10) =213253a(11) =925853a(12) =3879469a(13) =16223453a(14) =71442225a(15) =305928395a(16) =1305276203a(17) =5807259867a(18) =25240311855a(19) =109232894395a(20) =489780437147
External references
- oeis: A149578