Expansion of e.g.f. 1/(1-2*log(1+x)).

Terms

a(0) =1a(1) =2a(2) =6a(3) =28a(4) =172a(5) =1328a(6) =12272a(7) =132480a(8) =1633344a(9) =22663104a(10) =349324608a(11) =5923548288a(12) =109570736256