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 A164869 #3 Mar 30 2012 18:52:03 %S A164869 0,2,12,3,120,5,252,7,240,9,660,11,32760,13,84,15,8160,17,14364,19, %T A164869 6600,21,3036,23,65520,25,156,27,24360,29,429660,31,16320,33,204,35, %U A164869 69090840,37,228,39,541200,41,75852,43,30360,45,12972,47,2227680,49,3300,51,82680 %N A164869 n*A027642(n). %F A164869 a(n) = A164558(n) - A164555(n). %F A164869 a(n) = A027642(n) * A001477(n). %Y A164869 Cf. A164877 (bisection). %K A164869 nonn %O A164869 0,2 %A A164869 _Paul Curtz_, Aug 29 2009 %E A164869 Extended by _R. J. Mathar_, Sep 03 2009