Expansion of e.g.f. Bessel_I(2,2x) + Bessel_I(3,2x) + Bessel_I(4,2x).

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =5a(5) =5a(6) =21a(7) =21a(8) =84a(9) =84a(10) =330a(11) =330a(12) =1287a(13) =1287a(14) =5005a(15) =5005a(16) =19448a(17) =19448a(18) =75582a(19) =75582a(20) =293930a(21) =293930a(22) =1144066a(23) =1144066a(24) =4457400a(25) =4457400a(26) =17383860a(27) =17383860a(28) =67863915a(29) =67863915