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 A172554 #16 Oct 13 2024 13:05:34 %S A172554 1,48620,842090474940,89365729945562642000, %T A172554 21796558191507153941744357500,8588121524476528848476120449733261520, %U A172554 4623755659802671553551698062433487687144266000,3100343219257976442736156588732505699555692275498897600,2446263257880905042021634694206746192857701260816933527219717500 %N A172554 Number of 2*n X 18 binary arrays with row sums 9 and column sums n. %H A172554 Christoph Koutschan, <a href="/A172554/b172554.txt">Table of n, a(n) for n = 0..22</a> (terms n=1..12 from R. H. Hardin) %H A172554 Robert Dougherty-Bliss, Christoph Koutschan, Natalya Ter-Saakov, and Doron Zeilberger, <a href="https://arxiv.org/abs/2410.07435">The (Symbolic and Numeric) Computational Challenges of Counting 0-1 Balanced Matrices</a>, arXiv:2410.07435 [math.CO], 2024. %Y A172554 Column k=9 of A376935. %K A172554 nonn %O A172554 0,2 %A A172554 _R. H. Hardin_, Feb 06 2010 %E A172554 a(0)=1 prepended by _Andrew Howroyd_, Oct 12 2024