Coefficient of x^3 in expansion of (x+2) * (x+5) * ... * (x+3*n-1).

A383221

Coefficient of x^3 in expansion of (x+2) * (x+5) * ... * (x+3*n-1).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =26a(5) =595a(6) =14155a(7) =363944a(8) =10206700a(9) =312193524a(10) =10380710220a(11) =373619597736

External references