Values of k such that k^2 + (k+3)^2 is a square.

Terms

a(0) =0a(1) =9a(2) =60a(3) =357a(4) =2088a(5) =12177a(6) =70980a(7) =413709a(8) =2411280a(9) =14053977a(10) =81912588a(11) =477421557a(12) =2782616760a(13) =16218279009a(14) =94527057300a(15) =550944064797