G.f. A(x) satisfies Sum_{n=-oo..+oo} x^n * (1 - A(x)^n)^(n+2) = 0.

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-7a(4) =24a(5) =-90a(6) =345a(7) =-1373a(8) =5610a(9) =-23418a(10) =99373a(11) =-427370a(12) =1858665a(13) =-8160629a(14) =36123158a(15) =-161033302a(16) =722322008a(17) =-3257737848a(18) =14764170412a(19) =-67202964003a(20) =307090370840