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 A106032 #9 Dec 14 2019 21:32:08 %S A106032 1,1,2,1,1,2,2,2,1,2,1,2,1,2,1,2,2,4,1,2,2,1,2,2,2,2,1,2,2,1,1,2,4,1, %T A106032 1,4,2,2,2,3,1,4,2,3,1,2,4,1,2,4,4,2,1,2,1,2,2,2,1 %N A106032 a(n) is the number of orbits under the action of GL_2[Z] on the primitive binary quadratic forms of discriminant D, where D>1 is the n-th fundamental discriminant. %C A106032 A003646 is the same except it is under the action of SL_2[Z]. %H A106032 S. R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/">Class number theory</a> %H A106032 Steven R. Finch, <a href="/A000924/a000924.pdf">Class number theory</a> [Cached copy, with permission of the author] %H A106032 Jens Jonasson, <a href="http://www.mai.liu.se/~jejon/">Classes of integral binary quadratic forms</a>, Master's thesis (2001), Appendix B. %e A106032 D = 5, 8, 12, 13, 17, 21, 24, 28, ..., that is, A003658. %Y A106032 Cf. A003658, A003646. %K A106032 nonn %O A106032 1,3 %A A106032 _Steven Finch_, May 05 2005