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), (-1, 1, 0), (0, 0, 1), (1, 0, 0)}.
A149925
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), (-1, 1, 0), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =163a(6) =581a(7) =2127a(8) =7979a(9) =30353a(10) =117875a(11) =462727a(12) =1835691a(13) =7345512a(14) =29607177a(15) =120261572a(16) =491251251a(17) =2017406965a(18) =8322270169a(19) =34475449031a(20) =143385518330a(21) =598369350109
External references
- oeis: A149925