Expansion of 1/(1 - 6*x + x^2)^(7/2).

Terms

a(0) =1a(1) =21a(2) =280a(3) =3024a(4) =28854a(5) =253638a(6) =2103024a(7) =16689816a(8) =128014887a(9) =955485531a(10) =6974119152a(11) =49965080256a(12) =352366829724