The powerfree part of the central binomial coefficients.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =10a(5) =5a(6) =35a(7) =70a(8) =14a(9) =7a(10) =462a(11) =231a(12) =429a(13) =429a(14) =715a(15) =1430a(16) =24310a(17) =12155a(18) =92378a(19) =46189a(20) =88179a(21) =88179a(22) =1352078a(23) =676039a(24) =52003a(25) =52003a(26) =7429a(27) =7429a(28) =1077205a(29) =1077205