Expansion of e.g.f. log(sech(x) + arctanh(x)).
A013209
Expansion of e.g.f. log(sech(x) + arctanh(x)).
Terms
- a(0) =0a(1) =1a(2) =-2a(3) =7a(4) =-24a(5) =173a(6) =-1280a(7) =11779a(8) =-120960a(9) =1474969a(10) =-19695232a(11) =296068991a(12) =-4847011840a(13) =87094091589
External references
- oeis: A013209