Expansion of sinh(tan(x)*x)/2.A024263Expansion of sinh(tan(x)*x)/2.Terms a(0) =0a(1) =1a(2) =4a(3) =108a(4) =4448a(5) =276560a(6) =24034752a(7) =2782112704a(8) =413640580096External referencesoeis: A024263