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 A251550 #11 Dec 19 2014 14:17:05 %S A251550 1,1,2,2,2,2,2,2,3,3,3,3,3,3,5,5,5,5,5,5,5,6,8,8,8,8,8,8,8,9,9,9,9,9, %T A251550 9,9,9,9,9,9,9,9,11,11,11,11,11,11,11,11,14,14,14,14,14,14,14,14,14, %U A251550 14,15,18,18,18,18,18 %N A251550 a(n) = (A251549(n)-1)/2. %H A251550 Chai Wah Wu, <a href="/A251550/b251550.txt">Table of n, a(n) for n = 1..10000</a> %o A251550 (Haskell) %o A251550 a251550 = flip div 2 . subtract 1 . a251549 %o A251550 -- _Reinhard Zumkeller_, Dec 19 2014 %Y A251550 Cf. A098550, A247253, A251416, A251417, A251546-A251552. %K A251550 nonn %O A251550 1,3 %A A251550 _N. J. A. Sloane_, Dec 18 2014