Numerator in abs(binomial(-1/8,n)).

Terms

a(0) =1a(1) =1a(2) =9a(3) =51a(4) =1275a(5) =8415a(6) =115005a(7) =805035a(8) =45886995a(9) =331406075a(10) =4838528695a(11) =35629165845