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

Terms

a(0) =1a(1) =0a(2) =0a(3) =3a(4) =0a(5) =10a(6) =180a(7) =21a(8) =3360a(9) =45396a(10) =40320a(11) =2494855a(12) =30317760a(13) =84324318a(14) =3635503872a(15) =43081038105a(16) =261557237760