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 A360043 #8 Jan 24 2023 07:50:16 %S A360043 4,9,18,30,52,74,112,154,210,268,352,436,552,668,802,948,1134,1316, %T A360043 1546,1778,2038,2306,2630,2952,3326,3704,4124,4556,5060,5552,6126, %U A360043 6710,7338,7978,8674,9376,10174,10972,11824,12692,13664,14620,15690,16768,17898,19048,20314,21574,22944,24312 %N A360043 Number of edges in a Farey fan of order n. %C A360043 See the reference for the definition of a 'Farey fan'. See A360042 and A360044 for further details and images of the graph. %D A360043 McIlroy, M. D. "A Note on Discrete Representation of Lines". AT&T Technical Journal, 64 (1985), 481-490. %Y A360043 Cf. A005598 (regions), A360042 (vertices), A360044 (k-gons), A005728, A174030, A359976, A359970, A359693. %K A360043 nonn %O A360043 1,1 %A A360043 _Scott R. Shannon_, _N. J. A. Sloane_ and _M. Douglas McIlroy_, Jan 23 2023