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 A264765 #10 Feb 06 2017 14:28:22 %S A264765 1,1,3,7,17,78,195,616,1783,5120,16714,48843,150407,453178,1356478, %T A264765 4174538,12554221,38233788,115868736,350343710,1065875246,3225913135, %U A264765 9793613873,29699991965,90011535049,273180669975,828073217940,2511974932751,7618229843186 %N A264765 Number of tilings of a 5 X n rectangle using n pentominoes of shapes Z, I, P. %H A264765 Alois P. Heinz, <a href="/A264765/b264765.txt">Table of n, a(n) for n = 0..1000</a> %H A264765 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a> %e A264765 a(3) = 7: %e A264765 ._____. ._____. ._____. ._____. ._____. ._____. ._____. %e A264765 | | | | | | | | | | | | | | | | |_. | | ._| %e A264765 | | | | | | ._| | |_. | | ._| | |_. | | | |___| |___| | %e A264765 | | | | | |_| | | | |_| |_| | | | |_| | |___. | | .___| %e A264765 | | | | | | | | | | | | | | | | | |_| |_| | %e A264765 |_|_|_| |_|___| |_|___| |___|_| |___|_| |_____| |_____| . %Y A264765 Cf. A174249, A233427, A234931, A247268, A247443, A249762, A264812. %K A264765 nonn %O A264765 0,3 %A A264765 _Alois P. Heinz_, Nov 23 2015