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 A093877 #19 Jun 26 2025 01:22:25 %S A093877 1,4,28,234,2162,21272,218740,2323730,25314097,281299736,3176220308, %T A093877 36332751862,420086210688 %N A093877 Number of fixed n-celled polyzebras (or zebra-move-connected polyominoes). %C A093877 A polyzebra is a (2,3) leaper. A polyzebra need not be connected in the usual edge-connected sense. %C A093877 The first 9 terms coincide with A151830. - _John Mason_, Jun 24 2025 %Y A093877 Cf. A030444 (polyknights), A093989, A093990, A093991, A093992. %K A093877 nonn,more %O A093877 1,2 %A A093877 Guenter Stertenbrink (Sterten(AT)aol.com), May 21 2004 %E A093877 a(11) from _Joseph Myers_, May 21 2004 %E A093877 a(12) (computed by Gadi Aleksandrowicz's program) by _Gill Barequet_, Jun 09 2011 %E A093877 a(13) from _John Mason_, Jan 13 2023