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 A113454 #11 Mar 18 2018 09:41:05 %S A113454 3,4,4,5,6,8,8,8,10,12,16,12,16,16,20,16,20,24,32,32,24,32,32,40,48, %T A113454 64,32,40,48,64,64,80,48,64,64,80,96,128,128,64,80,96,128,128,160,192, %U A113454 256 %N A113454 Triangle giving maximal permanent P(n,k) of an n X n lower Hessenberg (0,1)-matrix with exactly k 1's for n >= 3 and 2n < k <= (8n)/3, read by rows. %H A113454 D. D. Olesky, B. L. Shader and P. van den Driessche, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v12i1r70/0">Permanents of Hessenberg (0,1)-matrices</a>, Electronic Journal of Combinatorics, 12 (2005) #R70. %H A113454 B. Shader <a href="http://www.uwyo.edu/bshader/hesstable.pdf">Table of known values of P(n,k) for n<=12.</a> %F A113454 P(n, k) = 2^(n-1) - (s(1) + s(2) + ... + s(h(n)-k)) where s(k) is the sequence A113452. %Y A113454 Cf. A034856, A113452, A113453, A113455. %K A113454 easy,nonn,tabf %O A113454 0,1 %A A113454 Bryan Shader (bshader(AT)uwyo.edu), Jan 07 2006