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 A216855 #24 Dec 18 2016 12:40:07 %S A216855 56,68,73,45,6,46,17,20,55,54,86,50,89,94,36,41,91,84,1,10,52,53,78, %T A216855 59,60,45,99,110,26,10,32,66,67,88,23,119,64,67,148,1997,1742 %N A216855 2-adic valuation of A216854(n). %C A216855 See the main entry A216854 for comments, motivation and links. %C A216855 Three further terms were provided for this sequence by Robert Gerbicz, but they have not been checked for their positioning. These are 26887, 35399 and 18350 (by their own relative locations, per the value of A216854). - _James G. Merickel_, Oct 01 2012 %o A216855 (PARI) A216855(n) = valuation(A216854(n),2) %K A216855 nonn,base,more %O A216855 1,1 %A A216855 _M. F. Hasler_, Sep 17 2012