Denominators of convergents to Pi/2.

Terms

a(0) =1a(1) =2a(2) =7a(3) =219a(4) =226a(5) =32989a(6) =33215a(7) =165849a(8) =364913a(9) =3085153a(10) =3450066a(11) =23785549a(12) =27235615a(13) =78256779a(14) =262005952a(15) =340262731a(16) =1623056876a(17) =1963319607a(18) =11439654911a(19) =13402974518a(20) =560961610149a(21) =574364584667