Expansion of tan(sinh(x))*x.A009683Expansion of tan(sinh(x))*x.Terms a(0) =0a(1) =2a(2) =12a(3) =222a(4) =8120a(5) =478810a(6) =41517828a(7) =4965965942a(8) =783389808112External referencesoeis: A009683