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 A254119 #4 Feb 17 2015 00:10:19 %S A254119 0,0,0,0,0,1,1,1,1,1,2,6,16,36,71,126,204,303,414,526,652,907,1705, %T A254119 4213,11329,29670,73408,171345,379494,802875,1632745,3210086,6134908, %U A254119 11457641,21020580,38076142 %N A254119 a(n) = A213709(n) - A255071(n). %F A254119 a(n) = A213709(n) - A255071(n). %o A254119 (Scheme) (define (A254119 n) (- (A213709 n) (A255071 n))) %Y A254119 Cf. A213709, A255071. %K A254119 nonn %O A254119 1,11 %A A254119 _Antti Karttunen_, Feb 15 2015