Expansion of o.g.f.: Sum_{n>=0} Product_{k=1..n} tanh(k*arctanh(x)).

A177389

Expansion of o.g.f.: Sum_{n>=0} Product_{k=1..n} tanh(k*arctanh(x)).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =98a(6) =514a(7) =3110a(8) =21334a(9) =163650a(10) =1388162a(11) =12902086a(12) =130391830a(13) =1423632546a(14) =16699055490a(15) =209432697830

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