Values of y such that x^2 + y^2 = 5^n with x and y coprime and 0 < x < y.

Terms

a(0) =2a(1) =4a(2) =11a(3) =24a(4) =41a(5) =117a(6) =278a(7) =527a(8) =1199a(9) =3116a(10) =6469a(11) =11753a(12) =33802a(13) =76443a(14) =136762a(15) =354144a(16) =873121a(17) =1721764a(18) =3565918a(19) =9653287a(20) =20783558a(21) =34867797a(22) =103232189a(23) =242017776a(24) =451910159a(25) =1064447283a(26) =2726446322a(27) =5583548873a(28) =10513816601a(29) =29729597084