Denominators a(n) of Pythagorean approximations b(n)/a(n) to 1/2.

Terms

a(0) =1a(1) =4a(2) =12a(3) =15a(4) =80a(5) =208a(6) =273a(7) =1428a(8) =3740a(9) =4895a(10) =25632a(11) =67104a(12) =87841a(13) =459940a(14) =1204140a(15) =1576239a(16) =8253296a(17) =21607408a(18) =28284465a(19) =148099380a(20) =387729212a(21) =507544127a(22) =2657535552a(23) =6957518400a(24) =9107509825a(25) =47687540548a(26) =124847601996a(27) =163427632719a(28) =855718194320