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 A005519 M1775 #24 Jan 31 2022 01:40:29
%S A005519 1,1,2,7,26,153,1134,11050,128987,1765252,27418060
%N A005519 Let T(n,d) = number of distinct d-dimensional polyominoes (or polycubes) with n cells (A049429, A049430); sequence gives Sum_{d} T(n,d).
%C A005519 These are free polyominoes, meaning that they are counted up to rotation, reflection, and translation. - _Peter Kagey_, Apr 30 2020
%D A005519 Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.
%D A005519 W. F. Lunnon, personal communication.
%D A005519 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A005519 R. C. Schroeppel, <a href="http://www.experimentalmath.info/workshop2004/schroeppel-talk.pdf">A few mathematical experiments</a>
%Y A005519 Row sums of A049429 or A049430.
%K A005519 nonn,nice,hard,more
%O A005519 1,3
%A A005519 _N. J. A. Sloane_
%E A005519 a(9) from Richard C. Schroeppel
%E A005519 a(10) and a(11) from _Peter Kagey_, Apr 30 2020, based on the rows John Niss Hansen added to A049430