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 A351127 #9 Feb 03 2022 05:54:15 %S A351127 1,0,0,0,1,0,0,1,2,0,0,1,2,0,0,4,4,0,0,7,7,0,0,16,11,0,0,29,20,0,0,67, %T A351127 36,0,0,119,65,0,0,264,117,0,0,478,216,0,0,1043,396,0,0,1910,736,0,0, %U A351127 4116,1369,0,0,7592,2558,0,0,16201,4787,0,0,30114,9006 %N A351127 Number of polyominoes with n cells with maximal symmetry and center of rotation about the center of a square. %C A351127 The sequence enumerates a subset of the polyominoes of maximal symmetry enumerated by A142886. %H A351127 John Mason, <a href="/A351127/b351127.txt">Table of n, a(n) for n = 1..163</a> %F A351127 For n multiple of 4, a(n) = A142886(n) - A346800(n/4); otherwise a(n) = A142886(n). %Y A351127 Cf. A000105, A142886, A346800. %K A351127 nonn,hard %O A351127 1,9 %A A351127 _John Mason_, Feb 02 2022