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 A298047 #13 Feb 16 2025 08:33:53 %S A298047 117,275,693,85,231,1155,187,429,855,2475,2035,2295,6325,195,1155, %T A298047 1755,495,1575,9405,10725,2925,12075,4901,1881,11753,7579,8789,16929, %U A298047 19305,5643,4599,17157,6435,935,26649,23751,10725,35321,35075,1105,2163,38475,38571,39195,5491,15939,51205,24225,9405,57275 %N A298047 The odd edge of a primitive 3-simplex (0, b=A031173, c=A031174, d=A031175). %C A298047 Each primitive 3-simplex (0,b,c,d) with b > c > d is built by 1 odd edge and 2 even edges; the edge that is considered here is the odd edge. %H A298047 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TrirectangularTetrahedron.html">Trirectangular Tetrahedron</a> %Y A298047 Cf. A298044, A298046, A031173, A031174, A031175. %K A298047 nonn %O A298047 1,1 %A A298047 _Ralf Steiner_, Jan 11 2018