E.g.f.: log(1 + log(1 - x))^2 / 2.

Terms

a(0) =1a(1) =6a(2) =40a(3) =315a(4) =2908a(5) =30989a(6) =375611a(7) =5112570a(8) =77305024a(9) =1286640410a(10) =23387713930a(11) =461187042992