Expansion of e.g.f.: exp(sinh(x))/exp(x).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =0a(5) =1a(6) =10a(7) =1a(8) =56a(9) =281a(10) =246a(11) =4621a(12) =16412a(13) =53197a(14) =564642a(15) =1937937a(16) =13309648a(17) =100397649a(18) =454215214a(19) =4082253589a(20) =26498068420a(21) =174791970677