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 A247598 #36 May 24 2018 15:58:10 %S A247598 1,11,471,122038,85820809,96018336018,146662126879117, %T A247598 291352421255114277,734102568216405642199,2304488853198195872625924, %U A247598 8882860158091727486388086786,41519759838668575020971562079517,232748666229847254694256869145439898,1549417862125158239133077344950011140191 %N A247598 Number of nonisomorphic binary n X n matrices with five 1's per column under row and column permutations. %H A247598 Andrew Howroyd, <a href="/A247598/b247598.txt">Table of n, a(n) for n = 5..40</a> %H A247598 StackExchange, <a href="http://math.stackexchange.com/questions/616834/">How many arrays with crossed cells, order of rows/columns irrelevant</a>, Dec 13 2013 %p A247598 seq(matrix_marks(n,5), n=3..15); # Using the uploaded program to A247417 %o A247598 (PARI) \\ See A304942 for Blocks %o A247598 a(n) = Blocks(n, n, 5); \\ _Andrew Howroyd_, May 24 2018 %Y A247598 Column k=5 of A304942. %Y A247598 Cf. A247417, A247596, A247597. %K A247598 nonn %O A247598 5,2 %A A247598 _Marko Riedel_, Sep 21 2014 %E A247598 Terms a(16) and beyond from _Andrew Howroyd_, May 24 2018