Denominators a(n) of Pythagorean approximations b(n)/a(n) to 1/3.

Terms

a(0) =1a(1) =12a(2) =24a(3) =35a(4) =468a(5) =900a(6) =1333a(7) =17760a(8) =34188a(9) =50615a(10) =674424a(11) =1298232a(12) =1922041a(13) =25610340a(14) =49298640a(15) =72986939a(16) =972518508a(17) =1872050076a(18) =2771581645a(19) =36930092952a(20) =71088604260a(21) =105247115567