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 A322451 #13 Sep 04 2023 02:49:51
%S A322451 1,0,0,1,3,29,2102,7011184,1788775603336,53304526022885280592,
%T A322451 366299663378889804782337225824,
%U A322451 1171638318502622784366970315264281830913536,3517726593606524901243694560022510194223171115509135178240
%N A322451 Number of unlabeled 3-uniform hypergraphs spanning n vertices.
%C A322451 3-uniform means that every edge consists of 3 vertices. - _Brendan McKay_, Sep 03 2023
%H A322451 Andrew Howroyd, <a href="/A322451/b322451.txt">Table of n, a(n) for n = 0..25</a>
%e A322451 Non-isomorphic representatives of the a(5) = 29 hypergraphs:
%e A322451 {{125}{345}}
%e A322451 {{123}{245}{345}}
%e A322451 {{135}{245}{345}}
%e A322451 {{145}{245}{345}}
%e A322451 {{123}{145}{245}{345}}
%e A322451 {{124}{135}{245}{345}}
%e A322451 {{125}{135}{245}{345}}
%e A322451 {{134}{235}{245}{345}}
%e A322451 {{145}{235}{245}{345}}
%e A322451 {{123}{124}{135}{245}{345}}
%e A322451 {{123}{145}{235}{245}{345}}
%e A322451 {{124}{134}{235}{245}{345}}
%e A322451 {{134}{145}{235}{245}{345}}
%e A322451 {{135}{145}{235}{245}{345}}
%e A322451 {{145}{234}{235}{245}{345}}
%e A322451 {{123}{124}{134}{235}{245}{345}}
%e A322451 {{123}{134}{145}{235}{245}{345}}
%e A322451 {{123}{145}{234}{235}{245}{345}}
%e A322451 {{124}{135}{145}{235}{245}{345}}
%e A322451 {{125}{135}{145}{235}{245}{345}}
%e A322451 {{135}{145}{234}{235}{245}{345}}
%e A322451 {{123}{124}{135}{145}{235}{245}{345}}
%e A322451 {{124}{135}{145}{234}{235}{245}{345}}
%e A322451 {{125}{135}{145}{234}{235}{245}{345}}
%e A322451 {{134}{135}{145}{234}{235}{245}{345}}
%e A322451 {{123}{124}{135}{145}{234}{235}{245}{345}}
%e A322451 {{125}{134}{135}{145}{234}{235}{245}{345}}
%e A322451 {{124}{125}{134}{135}{145}{234}{235}{245}{345}}
%e A322451 {{123}{124}{125}{134}{135}{145}{234}{235}{245}{345}}
%Y A322451 First differences of A000665.
%Y A322451 Cf. A006126, A006129, A038041, A299471, A301922, A302374, A302394, A306017, A306021.
%K A322451 nonn
%O A322451 0,5
%A A322451 _Gus Wiseman_, Dec 09 2018
%E A322451 a(12) from _Andrew Howroyd_, Dec 15 2018
%E A322451 Name corrected by _Brendan McKay_, Sep 03 2023