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 A144121 #3 Nov 30 2013 21:30:31 %S A144121 1,1,2,4,5,9,12,20,26,39,51,76,96,136,175,241,304,412,517,686,859, %T A144121 1117,1392,1794,2217,2818,3478,4373,5363,6694,8168,10113,12295,15105, %U A144121 18289,22347,26932,32712,39302,47481,56825,68347 %N A144121 Number of nonprime parts in the last section of the set of partitions of n. %C A144121 First differences of A144119. %F A144121 a(n) = A138137(n)-A144120(n) = A144119(n)-A144119(n-1). %Y A144121 Cf. A018252, A135010, A138121, A138137, A144117, A144118, A144119, A144120. %K A144121 easy,nonn %O A144121 1,3 %A A144121 _Omar E. Pol_, Sep 11 2008