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

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =0a(5) =0a(6) =10a(7) =1a(8) =0a(9) =280a(10) =120a(11) =1a(12) =15400a(13) =17160a(14) =2080a(15) =1401401a(16) =3203200a(17) =1290640a(18) =190623040a(19) =775975201a(20) =712150400a(21) =36321556720a(22) =239000886400a(23) =413465452401