Expansion of 2sinh(x) + BesselI_0(2x).

Terms

a(0) =1a(1) =2a(2) =2a(3) =2a(4) =6a(5) =2a(6) =20a(7) =2a(8) =70a(9) =2a(10) =252a(11) =2a(12) =924a(13) =2a(14) =3432a(15) =2a(16) =12870a(17) =2a(18) =48620a(19) =2a(20) =184756a(21) =2a(22) =705432a(23) =2a(24) =2704156a(25) =2a(26) =10400600a(27) =2a(28) =40116600a(29) =2