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 A251075 #7 Feb 06 2017 18:22:46 %S A251075 1,1,1,1,1,1,43,117,229,385,591,853,5789,17163,40521,84211,160143, %T A251075 284639,945352,2743255,7017326,16250983,34801374,69959957,179843441, %U A251075 479965811,1238082783,3015746329,6925030997,15065972891,35869626723,89673470947,226122534275 %N A251075 Number of tilings of a 18 X n rectangle using 3n hexominoes of shape I. %H A251075 Alois P. Heinz, <a href="/A251075/b251075.txt">Table of n, a(n) for n = 0..1000</a> %H A251075 Wikipedia, <a href="https://en.wikipedia.org/wiki/Hexomino">Hexomino</a> %Y A251075 Column k=6 of A251072. %Y A251075 Cf. A250663. %K A251075 nonn %O A251075 0,7 %A A251075 _Alois P. Heinz_, Nov 29 2014