Expansion of 1/Sum_{k>=0} (2*k+1)^2*x^k.

Terms

a(0) =1a(1) =-9a(2) =56a(3) =-328a(4) =1912a(5) =-11144a(6) =64952a(7) =-378568a(8) =2206456a(9) =-12860168a(10) =74954552a(11) =-436867144a(12) =2546248312a(13) =-14840622728a(14) =86497488056a(15) =-504144305608