Column 2 of triangle Q = A135885; also equals column 0 of Q^3 = A135893.

A135887

Column 2 of triangle Q = A135885; also equals column 0 of Q^3 = A135893.

Terms

    a(0) =1a(1) =6a(2) =42a(3) =351a(4) =3470a(5) =39968a(6) =528306a(7) =7906598a(8) =132426050a(9) =2457643895a(10) =50110693656

External references