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

A384269

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =16a(5) =49a(6) =154a(7) =513a(8) =1747a(9) =6078a(10) =21439a(11) =76607a(12) =276685a(13) =1008781a(14) =3707512a(15) =13721086a(16) =51088860a(17) =191245836a(18) =719333008a(19) =2717229481a(20) =10303797518a(21) =39208957744a(22) =149676496756a(23) =573037914270

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