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 A066273 #22 Sep 18 2024 16:34:18 %S A066273 0,0,0,1,0,0,4,0,3,24,4,18,151,25,136,992,184,938,6769,1300,6792,47469 %N A066273 Number of 3-dimensional polyominoes (or polycubes) with n cells and rotational symmetry group of order exactly 3. %C A066273 This sequence counts "one-sided" polycubes (A000162); chiral polycubes count twice. - _John Mason_, Sep 04 2024 %D A066273 W. F. Lunnon, Symmetry of cubical and general polyominoes, pp. 101-108 of R. C. Read, editor, Graph Theory and Computing. Academic Press, NY, 1972. %F A066273 a(n) = 2*D(n)+H(n)+FF(n), see Lunnon paper for naming convention. - _John Mason_, Sep 04 2024 %Y A066273 See A000162, A066281, A066283, A066287, A066288, A066453, A066454. %K A066273 nonn,more %O A066273 1,7 %A A066273 Brendan Owen (brendan_owen(AT)yahoo.com), Jan 01 2002 %E A066273 Name clarified by _John Mason_, Sep 04 2024 %E A066273 More terms from _John Mason_, Sep 18 2024