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 A329302 #39 Jan 14 2020 00:55:31 %S A329302 0,44,2320,54800,1146112,23278472,468028264,9376805048,187644496672, %T A329302 3753613318520,75077089399408,1501573939443704,30031693123408792, %U A329302 600635291349699440,12012715352891236816,240254370564131706488,4805087834658423387496,96101759515675744360544 %N A329302 Number of level-n cubes on a Menger Sponge that are enclosed in the inscribed sphere of the starting cube. %C A329302 A level-n cube is understood to be enclosed in a sphere if each of its 8 vertices lies either inside or on the surface of the sphere. %C A329302 This sequence is a 3D extension to A293288. %H A329302 Sierpinski copper coin, <a href="https://emathgroup.github.io/blog/xebsj-coin#menger">Table of results computed by Hong Yang Cao</a> (in Chinese). %H A329302 Wikipedia, <a href="https://en.wikipedia.org/wiki/Menger_sponge">Menger sponge</a>. %Y A329302 Cf. A117609, A120884, A293288. %K A329302 nonn %O A329302 1,2 %A A329302 _Zhao Hui Du_, Nov 30 2019 %E A329302 a(9)-a(18) from Ickiverar added by _Zhao Hui Du_, Jan 10 2020