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 A325607 #9 Jun 17 2019 02:26:37 %S A325607 10199370,13125369,13458288,21374352,22339875,29634813,39738060, %T A325607 32719728,42182412,47211294,51258282,53418859,43209969,55756413, %U A325607 48330114,49362234,62965329,52850433,72584082,73167345,73891893,71088744,61716444,66526029,69342999,80514873,71127132 %N A325607 Lower left-hand y-coordinate for 4 X 4 invisible forest with 0 < x < y. %C A325607 These are 4 X 4 rectangles of lattice points not visible along straight lines of sight from the origin. The sequence is ordered by Euclidean distance from (0,0). %H A325607 E. Goins, P. Harris, B. Kubik, A. Mbirika, <a href="https://arxiv.org/abs/1710.04554">Lattice Point Visibility on Generalized Lines of Sight</a>, arXiv:1710.04554 [math.NT], 2017; Amer. Math. Monthly 125 (2018) 593-601. %H A325607 F. Herzog, B. M. Stewart, <a href="https://www.jstor.org/stable/2317753">Patterns of Visible and Nonvisible Lattice Points</a>, Amer. Math. Monthly 78 (1971) 487-496 %H A325607 S. Laishram, F. Luca, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL18/Laishram/lai2.html">Rectangles Of Nonvisible Lattice Points</a>, J. Int. Seq. 18 (2015) 15.10.8. %e A325607 (7247643, 10199370), (6349914, 13125369), (13449225, 13458288), (3268473, 21374352), (16799913, 22339875) %Y A325607 Cf. A157426, A157427, A157428, A157429. %Y A325607 Cf. A325602, A325603, A325604, A325605, A325606. %K A325607 nonn %O A325607 1,1 %A A325607 _Benjamin Hutz_, May 31 2019 %E A325607 a(6)-a(27) from _Giovanni Resta_, Jun 05 2019