Numerator of [x^(2n+1)] in the Taylor expansion arctan(cosec(x) - cosech(x)).

A013533

Numerator of [x^(2n+1)] in the Taylor expansion arctan(cosec(x) - cosech(x)).

Terms

    a(0) =1a(1) =-1a(2) =67a(3) =-319a(4) =172747a(5) =-5036627a(6) =12689179a(7) =-142848518639

External references