Expansion of 1/((1-x)(1-4x)(1-10x)(1-20x)).

A080250

Expansion of 1/((1-x)(1-4x)(1-10x)(1-20x)).

Terms

    a(0) =1a(1) =35a(2) =871a(3) =19215a(4) =402591a(5) =8236095a(6) =166570111a(7) =3349906175a(8) =67183250431

External references