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 A225904 #10 Sep 16 2016 17:16:17
%S A225904 1,4,19,145,1679,5191,153311,7286005,69689327,2869226821,572447760301,
%T A225904 6593608277800,3438637721790797,966842075996112436,
%U A225904 119933240206586434591,264753799412041684949165,945570749875765527295137611,303554979754466691916744807193
%N A225904 Numerator of Sum_{k=1..n} 1/L(k) where L(n) is the n-th Lucas number (A000204).
%e A225904 1, 4/3, 19/12, 145/84, 1679/924, 5191/2772, ... = A225904/A225905.
%t A225904 Numerator[Table[Sum[1/LucasL[k], {k, 1, n}], {n, 1, 30}]]
%t A225904 Numerator[Accumulate[1/LucasL[Range[20]]]] (* _Harvey P. Dale_, Sep 16 2016 *)
%Y A225904 Cf. A000204, A059248, A035105, A225905.
%K A225904 nonn,frac,easy
%O A225904 1,2
%A A225904 _Michel Lagneau_, May 20 2013