Expansion of (1-x^13) / (1-x)^13.

Terms

a(0) =1a(1) =13a(2) =91a(3) =455a(4) =1820a(5) =6188a(6) =18564a(7) =50388a(8) =125970a(9) =293930a(10) =646646a(11) =1352078a(12) =2704156a(13) =5200299a(14) =9657687a(15) =17383769a(16) =30421300a(17) =51894115a(18) =86487037a(19) =141101961a(20) =225742452a(21) =354691350a(22) =548060110a(23) =833805154a(24) =1250325622a(25) =1849778840a(26) =2702274848a(27) =3901139736a(28) =5569469620