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

A068556

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

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =4a(5) =4a(6) =377a(7) =1202a(8) =133211a(9) =1082357a(10) =3730351411a(11) =6203235575

External references