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 A368030 #18 Dec 10 2023 11:43:04 %S A368030 1,3,12,47,168,532,1344,2707,5064,11236,24768,53614,112464,222564, %T A368030 411008,723884,1263696,2236452,3953448,6855498,11544816,18880992, %U A368030 30104592,46815126,70776080,103864092,148069152,205499496,278917752,373204912,496855592,663056406,890682648,1205069272 %N A368030 Number of fixed midpoint-free polycubes of size n. %C A368030 Midpoint-free means that no three cubes are in positions (x,y,z), (x+dx,y+dx,z+dz), and (x+2*dx,y+2*dx,z+2*dz). %Y A368030 Cf. A368029. %K A368030 nonn %O A368030 1,2 %A A368030 _Joerg Arndt_, Dec 08 2023