Define R_{1}(x)=1, R_{n+1}(x)=(R_n(x)*2*x/(1+x^2))'; then a(n)=R_{n}(1).

A339513

Define R_{1}(x)=1, R_{n+1}(x)=(R_n(x)*2*x/(1+x^2))'; then a(n)=R_{n}(1).

Terms

    a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =-2a(5) =-45a(6) =347a(7) =-756a(8) =-13031a(9) =184245a(10) =-810034a(11) =-11404503a(12) =264733177a(13) =-1931955480a(14) =-21453955777a(15) =796153961091

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