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 A367557 #17 Sep 25 2024 11:30:30 %S A367557 4,40,260,1428,7184,34238,157398,705518,3104394,13469766,57811669, %T A367557 245990766 %N A367557 The number of fixed kissing polyominoes with n cells. %C A367557 Translations are allowed, but not rotations or reflections. %C A367557 A polyomino is 'kissing' if there exist two cells that touch only at a corner such that no cell exists touching both edgewise simultaneously. %C A367557 First thirteen terms calculated by filtering the output of Redelmeier's Algorithm. %H A367557 Alain Goupil, Marie-Eve Pellerin, and Jérôme de Wouters d'Oplinter, <a href="https://doi.org/10.1016/j.dam.2017.09.003">Partially Directed Snake Polyominoes</a>, Discrete Applied Mathematics, Volume 236, 2018. %e A367557 The smallest kissing polyomino has area 7; its four rotations determine the first term in the sequence: %e A367557 OOO %e A367557 O O %e A367557 OO %Y A367557 Cf. A182644, A376496. %K A367557 nonn,hard,more %O A367557 7,1 %A A367557 _Johann Peters_, Nov 22 2023 %E A367557 a(14)-a(18) from _John Mason_, Sep 25 2024