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 A366932 #87 Nov 13 2023 11:30:19 %S A366932 3,9,51,255,855,2193,4719,8991,15675,25545,39483,58479,83631,116145, %T A366932 157335,208623,271539,347721,438915,546975,673863,821649,992511, %U A366932 1188735,1412715,1666953,1954059,2276751,2637855,3040305,3487143,3981519,4526691,5126025,5782995,6501183,7284279 %N A366932 Number of edges formed after n points have been placed in general position on each edge of the triangle in A365929. %C A366932 See A365929 for more information. See A365929 and A367015 for images of the triangle. %F A366932 Conjecture: a(n) = 3*(3/2*n^4 - 2*n^3 + 3/2*n^2 + n + 1). %F A366932 a(n) = A367015(n) + 3*A366478(n) - 1 by Euler's formula. %Y A366932 Cf. A365929 (internal vertices), A367015 (regions), A366478. %K A366932 nonn %O A366932 0,1 %A A366932 _Scott R. Shannon_, Nov 02 2023