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 A176673 #13 Oct 02 2022 19:28:20
%S A176673 1,3,9,28,91,307,1067,3792,13702,50148,185416,691277,2595167,9800041,
%T A176673 37194707,141787644,542583488,2083404030,8024142706,30988922366,
%U A176673 119972435149,465505007827,1809877343351,7049866113619,27507668129630
%N A176673 Partial sums of A001168.
%C A176673 Partial sums of number of fixed polyominoes with n cells, for n > 0.
%H A176673 John Mason, <a href="/A176673/b176673.txt">Table of n, a(n) for n = 1..56</a>
%F A176673 a(n) = Sum_{i=1..n} A001168(i).
%e A176673 a(6) = 1 + 2 + 6 + 19 + 63 + 216 = 307.
%Y A176673 Cf. A001168, A000105, A006746, A056877, A006748, A056878, A006747, A006749, A006762.
%K A176673 nonn
%O A176673 1,2
%A A176673 _Jonathan Vos Post_, Apr 23 2010