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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", , Springer-Verlag, 1999, p. 110.
Convolution square of A004016.
B. Bruce C. Berndt, Ramanujan's Notebooks Part III, Springer-Verlag, 1991, see p. 460, Entry 3(i).
Michael Gilleland, <a href="/selfsimilar.html">Some Self-Similar Integer Sequences</a>.
M. Masanobu Kaneko and Y. Yuichi Sakai, <a href="http://arxiv.org/abs/1201.1685">The Ramanujan-Serre Differential Operators and certain Elliptic Curves</a>, arXiv:1201.1685 [math.NT], 2012.
G. Gabriele Nebe and N. J. A. Sloane, <a href="http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/A2.html">Home page for hexagonal (or triangular) lattice A2</a>.
Convolution square of A004016Sum_{k=1..n} a(k) ~ c * n^2, where c = 2*Pi^2/3. - _Amiram Eldar_, Jan 21 2024
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(MAGMAMagma) Basis( ModularForms( Gamma0(3), 2), 70)[1]; /* Michael Somos, Jun 12 2014 */
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Masao Koike, Modular forms on non-compact arithmetic triangle groups, preprint.
Masao Koike, <a href="https://oeis.org/A004016/a004016.pdf">Modular forms on non-compact arithmetic triangle groups</a>, Unpublished manuscript [Extensively annotated with OEIS A-numbers by N. J. A. Sloane, Feb 14 2021. I wrote 2005 on the first page but the internal evidence suggests 1997.]
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