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 A277716 #8 Oct 30 2016 13:47:54 %S A277716 3,7,15,31,63,127,219,255,291,439,511,583,819,879,1023,1167,1443,1639, %T A277716 1747,1759,1915,2047,2115,2335,2887,3187,3279,3339,3495,3519,3831, %U A277716 4095,4231,4671,5043,5775,5995,6375,6559,6679,6991,7039,7323,7663,8191,8463,8931,9343,10087,10515,11551,11991,12531,12751,12827,13119,13359,13983,14079,14647,15327,16383 %N A277716 a(n) = A277715(n) / 3. %H A277716 Antti Karttunen, <a href="/A277716/b277716.txt">Table of n, a(n) for n = 1..444</a> %F A277716 a(n) = A277715(n) / 3. %o A277716 (Scheme) (define (A277716 n) (/ (A277715 n) 3)) %Y A277716 Cf. A277715. %Y A277716 Cf. A000225 (seems to be a subsequence from 3 onward). %K A277716 nonn %O A277716 1,1 %A A277716 _Antti Karttunen_, Oct 29 2016