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 A139681 #9 May 08 2020 17:26:24 %S A139681 1,2,8,64,1024,32768,1914733,178499118,23973965155,4356864886906, %T A139681 1028823851939030,306635655405986312,112789704243814005142, %U A139681 50281311185009713150048,26760450115727957945767409,16787646103442094018698106106,12278130772483524854754380090307 %N A139681 Number of n X n symmetric binary matrices with no row sum greater than 5. %H A139681 Andrew Howroyd, <a href="/A139681/b139681.txt">Table of n, a(n) for n = 0..30</a> %Y A139681 Column k=5 of A334548. %K A139681 nonn %O A139681 0,2 %A A139681 _R. H. Hardin_, Jun 13 2008 %E A139681 Terms a(13) and beyond from _Andrew Howroyd_, May 08 2020