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 A213179 #23 Mar 01 2019 06:21:12 %S A213179 1,11,15,21,28,88,245,396,501,979,1218,1505,1859,2802,3421,6155,18669, %T A213179 26587,44567,52779,62377,102113,225638,307077,357610,415910,650078, %U A213179 870815,1006279,1161760,2043984,3544750,4059132,6066082,6924325,7898238,13271830 %N A213179 Numbers k such that 2*k is a partition number. %F A213179 a(n) = A052001(n)/2. %e A213179 11 is in the sequence because 2*11 = 22 and 22 is a partition number: p(8) = A000041(8) = 22. %t A213179 Select[PartitionsP[Range@200]/2, IntegerQ] (* _Giovanni Resta_, May 05 2013 *) %Y A213179 Cf. A000041, A052001, A213365, A216258, A217725, A217726, A222175, A222178, A222179, A225317, A225323. %K A213179 nonn %O A213179 1,2 %A A213179 _Omar E. Pol_, Feb 27 2013