Expansion of 1/(2 - g^2)^2, where g = 1+x*g^2 is the g.f. of A000108.

A390423

Expansion of 1/(2 - g^2)^2, where g = 1+x*g^2 is the g.f. of A000108.

Terms

    a(0) =1a(1) =4a(2) =22a(3) =120a(4) =647a(5) =3452a(6) =18254a(7) =95800a(8) =499555a(9) =2590636a(10) =13370698a(11) =68720584a(12) =351900110a(13) =1796100440a(14) =9140521052a(15) =46394675440a(16) =234926244899

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