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, 0, 0), (1, 1, 1)}.
A150067
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, 0, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =64a(5) =214a(6) =796a(7) =2794a(8) =10592a(9) =38234a(10) =146796a(11) =539662a(12) =2088738a(13) =7776760a(14) =30258146a(15) =113711678a(16) =444230508a(17) =1681513286a(18) =6589197570a(19) =25083944980a(20) =98521225220a(21) =376782492454
External references
- oeis: A150067