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 A070768 #15 Dec 04 2023 06:40:03 %S A070768 0,0,0,0,0,4,37,381,2717,18760,116439,565943,3033697,14835067, %T A070768 72633658,356923880,1746833634,8532601529,41868336466,205618704167, %U A070768 1012359995953 %N A070768 Number of polyhexes with n cells without holes that do not tile the plane. %D A070768 M. Gardner, Tiling with Polyominoes, Polyiamonds and Polyhexes. Chap. 14 in Time Travel and Other Mathematical Bewilderments. New York: W. H. Freeman, pp. 175-187, 1988. %H A070768 Craig S. Kaplan, <a href="https://isohedral.ca/heesch-numbers-of-unmarked-polyforms/">Heesch Numbers of Unmarked Polyforms</a> %H A070768 Craig S. Kaplan, <a href="https://arxiv.org/abs/2105.09438">Heesch Numbers of Unmarked Polyforms</a>, arXiv:2105.09438 [cs.CG], 2021. See Table 3 and Table 4. %H A070768 Joseph Myers, <a href="http://www.polyomino.org.uk/mathematics/polyform-tiling/">Polyhex tiling</a> %Y A070768 Cf. A018190, A070766, A070767, A038144, A054361, A071334. %K A070768 nonn,hard,more %O A070768 1,6 %A A070768 _Joseph Myers_, May 05 2002 %E A070768 More terms from _Joseph Myers_, Nov 06 2003 %E A070768 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007