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 A353934 #10 May 12 2022 18:37:05 %S A353934 1,1,11,369,83374,90916452,546063639624,17259079054003609, %T A353934 2916019543694306398589,2620143594924539083433405392, %U A353934 12541344781693990981151732534871036,319608708168951734031266758322647453517098,43373075269161087186367095378869660507262626652634 %N A353934 Number of tilings of an n X n square using right trominoes, dominoes, and monominoes. %H A353934 Alois P. Heinz, <a href="/A353934/b353934.txt">Table of n, a(n) for n = 0..16</a> %H A353934 Wikipedia, <a href="https://en.wikipedia.org/wiki/Polyomino">Polyomino</a> %F A353934 a(n) = A353877(n,n). %e A353934 a(2) = 11: %e A353934 .___. .___. .___. .___. .___. .___. .___. .___. .___. .___. .___. %e A353934 |_|_| |___| | | | |_|_| |___| |_| | | |_| |_| | |_. | | ._| | |_| %e A353934 |_|_| |___| |_|_| |___| |_|_| |_|_| |_|_| |___| |_|_| |_|_| |___| . %Y A353934 Main diagonal of A353877. %Y A353934 Cf. A004003, A028420, A063443, A219874, A219952, A219994, A220061, A220778, A233807, A270071, A353777. %K A353934 nonn %O A353934 0,3 %A A353934 _Alois P. Heinz_, May 11 2022