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 A007823 #11 Jul 19 2013 05:02:43 %S A007823 1,2,5,14,45,186,945,5778,44037,403470,4344877,56072378,793804721, %T A007823 12734185106,229632768005,4628786367502,105803768420397, %U A007823 2626282179198138,71539181027191729,2076395667668755090,65704452165048754181 %N A007823 A007824(n)/16. %C A007823 Previous name was: For N=Sum a(i).2^i, where the a(i) are binary, define a "derivative" D(N)/D(2)=Sum i.a(i).2^(i-1); sequence gives n-th derivative of 16 (divided by 16) (cf A007824). %F A007823 a(n) = A007824(n)/16. - _Michel Marcus_, Jul 18 2013 %K A007823 nonn %O A007823 0,2 %A A007823 Ralph Buchholz [ ralph(AT)defcen.gov.au ], Leisa Condie %E A007823 Edited by _Michel Marcus_, Jul 18 2013