G.f. satisfies: A(x) = exp( Sum_{n>=1} (A(x) + (-1)^n)^n * x^n/n ).

Terms

a(0) =1a(1) =0a(2) =2a(3) =2a(4) =12a(5) =20a(6) =96a(7) =212a(8) =898a(9) =2354a(10) =9266a(11) =27070a(12) =102094a(13) =319930a(14) =1177838a(15) =3865762a(16) =14050948a(17) =47574460a(18) =171886784a(19) =594572676a(20) =2143957648a(21) =7528825924a(22) =27156892364a(23) =96412294088a(24) =348314869652