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 A231677 #7 Sep 20 2017 11:46:30
%S A231677 0,1,5,14,30,55,91,92,96,105,121,146,182,231,235,244,260,285,321,370,
%T A231677 434,443,459,484,520,569,633,714,730,755,791,840,904,985,1085,1110,
%U A231677 1146,1195,1259,1340,1440,1561,1597,1646,1710,1791,1891,2012,2156,2157,2161,2170,2186,2211,2247,2296,2300,2309,2325,2350,2386,2435,2499,2508,2524,2549,2585,2634,2698,2779
%N A231677 a(n) = Sum_{i=0..n} digsum_7(i)^2, where digsum_7(i) = A053828(i).
%H A231677 Jean Coquet, <a href="https://doi.org/10.1016/0022-314X(86)90067-3">Power sums of digital sums</a>, J. Number Theory 22 (1986), no. 2, 161-176.
%H A231677 P. J. Grabner, P. Kirschenhofer, H. Prodinger, R. F. Tichy, <a href="http://math.sun.ac.za/~hproding/abstract/abs_80.htm">On the moments of the sum-of-digits function</a>, <a href="http://math.sun.ac.za/~hproding/pdffiles/st_andrews.pdf">PDF</a>, Applications of Fibonacci numbers, Vol. 5 (St. Andrews, 1992), 263-271, Kluwer Acad. Publ., Dordrecht, 1993.
%H A231677 J.-L. Mauclaire, Leo Murata, <a href="https://dx.doi.org/10.3792/pjaa.59.274">On q-additive functions. I</a>, Proc. Japan Acad. Ser. A Math. Sci. 59 (1983), no. 6, 274-276.
%H A231677 J.-L. Mauclaire, Leo Murata, <a href="https://dx.doi.org/10.3792/pjaa.59.441">On q-additive functions. II</a>, Proc. Japan Acad. Ser. A Math. Sci. 59 (1983), no. 9, 441-444.
%H A231677 J. R. Trollope, <a href="http://www.jstor.org/stable/2687954">An explicit expression for binary digital sums</a>, Math. Mag. 41 1968 21-25.
%o A231677 (PARI) a(n) = sum(i=0, n, sumdigits(i, 7)^2); \\ _Michel Marcus_, Sep 20 2017
%Y A231677 Cf. A053828, A231676, A231678, A231679.
%K A231677 nonn,base
%O A231677 0,3
%A A231677 _N. J. A. Sloane_, Nov 13 2013