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), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
A149007
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), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =34a(5) =120a(6) =483a(7) =1886a(8) =7877a(9) =32410a(10) =139157a(11) =590465a(12) =2582112a(13) =11196190a(14) =49611062a(15) =218515018a(16) =978137394a(17) =4358768473a(18) =19667296795a(19) =88439181398a(20) =401608599218
External references
- oeis: A149007