Expansion of 1/((1-x)(1-3x)(1-5x)(1-9x)).

A021454

Expansion of 1/((1-x)(1-3x)(1-5x)(1-9x)).

Terms

    a(0) =1a(1) =18a(2) =220a(3) =2310a(4) =22561a(5) =212268a(6) =1957600a(7) =17857620a(8) =161924521a(9) =1463379918a(10) =13200803980a(11) =118959425130

External references