From denominators in expansion of tan(arcsinh(x)) - sin(arctanh(x)).

A068557

From denominators in expansion of tan(arcsinh(x)) - sin(arctanh(x)).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =189a(5) =189a(6) =12474a(7) =43659a(8) =4191264a(9) =37721376a(10) =120406632192a(11) =220745492352

External references