Expansion of g.f. 8/(1+sqrt(1-8*x))^3.

Terms

a(0) =1a(1) =6a(2) =36a(3) =224a(4) =1440a(5) =9504a(6) =64064a(7) =439296a(8) =3055104a(9) =21498880a(10) =152807424a(11) =1095450624a(12) =7911587840a(13) =57511157760a(14) =420459724800