Numerators of convergents to Pi/2.

Terms

a(0) =1a(1) =2a(2) =3a(3) =11a(4) =344a(5) =355a(6) =51819a(7) =52174a(8) =260515a(9) =573204a(10) =4846147a(11) =5419351a(12) =37362253a(13) =42781604a(14) =122925461a(15) =411557987a(16) =534483448a(17) =2549491779a(18) =3083975227a(19) =17969367914a(20) =21053343141a(21) =881156436695a(22) =902209779836