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 A331139 #11 Jan 29 2020 10:14:25 %S A331139 1,16,36,64,152,144,196,576,324,400,1024,576,912,1392,900,1024,2304, %T A331139 2304,1444,3136,1764,1936,5472,2304,3152,5184,2916,5184,6400,3600, %U A331139 3844,9728,7056,4624,9216,5184,5476,14592,9216,6400,12552,7056,11664,14400,8100 %N A331139 Number of different coincidence site lattices of index 2n-1 in lattice D_4. %C A331139 Differs from A031360 if n is divisible by the square of an odd prime. %H A331139 Michael Baake and Peter Zeiner, <a href="https://doi.org/10.1080/14786430701846206">Coincidences in 4 dimensions</a>, Phil. Mag. 88 (2008), 2025-2032; arXiv:<a href="https://arxiv.org/abs/0712.0363">0712.0363</a> [math.MG]. See end of Section 2.1. %H A331139 <a href="/index/Da#D4">Index entries for sequences related to D_4 lattice</a> %Y A331139 Cf. A031360, A331140, A331141, A331142. %K A331139 nonn %O A331139 1,2 %A A331139 _N. J. A. Sloane_, Jan 12 2020 %E A331139 Terms a(10) and beyond added and name corrected by _Andrey Zabolotskiy_, Jan 29 2020