Expansion of e.g.f. sinh(2 * (exp(x)-1)) / 2.

Terms

a(0) =0a(1) =1a(2) =1a(3) =5a(4) =25a(5) =117a(6) =601a(7) =3509a(8) =22457a(9) =153141a(10) =1105561a(11) =8453557a(12) =68339833a(13) =581495605a(14) =5184047961a(15) =48259748533a(16) =468040609593