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

Terms

a(0) =1a(1) =2a(2) =6a(3) =26a(4) =144a(5) =962a(6) =7536a(7) =67706a(8) =685824a(9) =7730882a(10) =95970816a(11) =1300815386a(12) =19113775104a(13) =302616787202