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 A028919 #9 Jun 13 2015 00:49:09
%S A028919 0,6,10,12,14,20,24,26,28,34,38,40,42,48,52,54,56,62,66,68,70,76,80,
%T A028919 82,84,90,94,96,98,104,108,110,112,118,122,124,126,132,136,138,140,
%U A028919 146,150,152,154,160,164,166,168,174,178,180,182,188,192,194,196,202,206,208,210,216,220,222,224,230,234,236
%N A028919 Congruent to 0, 6, 10, 12 (mod 14).
%H A028919 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,1,-1).
%F A028919 a(n) = 2*A047328(n). G.f. 2*x^2*(3+2*x+x^2+x^3) / ( (1+x)*(x^2+1)*(x-1)^2 ). - R. J. Mathar, Oct 08 2011
%t A028919 With[{c=14*Range[0,20]},Union[Flatten[{c,c+6,c+10,c+12}]]] (* _Harvey P. Dale_, Dec 25 2011 *)
%K A028919 nonn
%O A028919 1,2
%A A028919 Jan.Hagberg(AT)stat.su.se
%E A028919 Corrected by R. J. Mathar, Oct 08 2011