Square roots of squares in A068176.

Terms

a(0) =5a(1) =15a(2) =35a(3) =115a(4) =365a(5) =3215a(6) =32150a(7) =321500a(8) =3215000a(9) =32150000a(10) =321500000a(11) =3215000000a(12) =32150000000a(13) =321500000000