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), (1, 0, 0), (1, 1, -1)}.
A149966
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), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =54a(5) =195a(6) =739a(7) =2898a(8) =11665a(9) =47978a(10) =201023a(11) =854393a(12) =3677078a(13) =15998576a(14) =70258094a(15) =311037123a(16) =1386937967a(17) =6224225938a(18) =28091605154a(19) =127435565082a(20) =580796534604
External references
- oeis: A149966