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 A295225 #9 Nov 22 2017 01:38:51
%S A295225 0,0,1,2,7,29,147,883,6156,48942,437404,4343041,47444364,565601104,
%T A295225 7307463941,101713884677,1517483769898,24157610375637,408751073418742,
%U A295225 7325240566502843,138608292368966173,2761503816421313729,57782245813372891911,1266895493728240876072
%N A295225 Sum of antidiagonals of triangle of 2-Stirling numbers of the first kind.
%H A295225 Edyta Hetmaniok, Barbara Smoleń, Roman Wituła, <a href="http://ceur-ws.org/Vol-1853/p07.pdf">The Stirling triangles</a>, Proceedings of the Symposium for Young Scientists in Technology, Engineering and Mathematics (SYSTEM 2017), Kaunas, Lithuania, April 28, 2017, p. 35-41.
%F A295225 a(n) = Sum_{k=0..[n/2]} A143491(n-k,k).
%K A295225 nonn
%O A295225 2,4
%A A295225 _Eric M. Schmidt_, Nov 18 2017