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 A172298 #9 May 20 2021 12:23:43 %S A172298 1,-1,1,0,1,0,1,0,1,0,25,0,477481,0,49,0,13082689,0,1924313689,0, %T A172298 30489001321,0,730192467169,0,55867983514256281,0,73155570928609,0, %U A172298 564036899167989738841,0,74232720893311466588760025,0,59433630916551169012841089,0,6644474695172651051906689 %N A172298 a(n) = A027641(n) * A164555(n). %C A172298 Squares of Bernoulli number numerators (apart from the sign flipped at a(1)). %C A172298 The associated denominators of the squared Bernoulli numbers are in A172282. %Y A172298 Cf. A027641, A164555, A172282. %K A172298 sign %O A172298 0,11 %A A172298 _Paul Curtz_, Jan 31 2010 %E A172298 Edited and extended by _R. J. Mathar_, Feb 02 2010