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, -1), (-1, 0, 1), (0, 1, -1), (1, 0, 0), (1, 1, 0)}.
A150077
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, -1), (-1, 0, 1), (0, 1, -1), (1, 0, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =66a(5) =237a(6) =910a(7) =3560a(8) =14383a(9) =58323a(10) =241477a(11) =1013972a(12) =4289049a(13) =18269560a(14) =78604459a(15) =340648176a(16) =1481407067a(17) =6480432790a(18) =28510899226a(19) =125905971260a(20) =557644102835
External references
- oeis: A150077