Denominators of coefficients of 1/2^(2n+1) in Newton's series for Pi.

Terms

a(0) =1a(1) =3a(2) =5a(3) =28a(4) =72a(5) =704a(6) =1664a(7) =2560a(8) =17408a(9) =311296a(10) =688128a(11) =3014656a(12) =6553600a(13) =56623104a(14) =121634816a(15) =520093696a(16) =369098752a(17) =7516192768a(18) =79456894976a(19) =111669149696a(20) =704374636544a(22) =824633720832