This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A053374 #12 Apr 14 2019 11:01:13 %S A053374 1,2,1,4,42,1,2,6,6,2,3588,13,8,8,30,5,6,1,1122,221064,10,389,2,96, %T A053374 28254,1,5,12606,4,12,12,1716,616,132015642,1,110,120,2,550,3774,14, %U A053374 221,4148,2,47533775646,17,10,1,6,756,5662,16,16,6485718,42,85,150 %N A053374 Write fundamental unit for real quadratic field of discriminant n as x + y*omega; sequence gives values of y for n == 2 mod 4. %C A053374 Entries are indexed by values of n from A039956. %D A053374 R. A. Mollin, Quadratics, CRC Press, 1996, Tables B1-B3. %H A053374 S. R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/">Class number theory</a> %H A053374 Steven R. Finch, <a href="/A000924/a000924.pdf">Class number theory</a> [Cached copy, with permission of the author] %t A053374 sf = Select[2*Range[0, 139], SquareFreeQ]; NumberFieldFundamentalUnits[Sqrt[#]][[1, 2, 2]]& /@ sf (* _Jean-François Alcover_, May 31 2013 *) %Y A053374 Cf. A053370-A053375. %K A053374 nonn,easy,nice %O A053374 0,2 %A A053374 _N. J. A. Sloane_, Jan 06 2000