Expansion of e.g.f. exp(x * cosh(3*x)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =28a(4) =109a(5) =676a(6) =10261a(7) =65584a(8) =881497a(9) =11930896a(10) =122708521a(11) =2186539840a(12) =30542901445a(13) =477545743936