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 A071453 #9 Aug 27 2015 12:46:49 %S A071453 1,1,1,0,2,2,1,3,4,0,1,1,1,3,2,2,2,3,4,0,1,5,4,3,2,2,2,3,1,0,1,0,4,3, %T A071453 2,2,2,0,1,0,1,0,4,3,2,5,4,0,1,0,1,0,2,3,2,3,4,0,1,0,1,3,2,3,2,3,4,0, %U A071453 1,0,4,3,2,3,2,3,1,0,1,0,4,3,2,3,2,0,1,0,1,0,4,3,2,3,4,0,1,0,1,0,2,3,2,3,4 %N A071453 Sprague-Grundy values for octal game .117. %C A071453 Octal games .051 and .053 have values a(n-1). %C A071453 Sequence is eventually periodic with period 48. The only exceptions are n=2, 6, 7, 12, 16, 22, 26, 36 and 46. %D A071453 E. R. Berlekamp, J. H. Conway and R. K. Guy, Winning Ways, Academic Press, NY, 2 vols., 1982; see Chapter 4, p. 104. %H A071453 Achim Flammenkamp, <a href="http://www.uni-bielefeld.de/~achim/octal_sparse.html">Octal games</a> %H A071453 <a href="/index/Rec#order_48">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1). %K A071453 nonn %O A071453 1,5 %A A071453 _N. J. A. Sloane_ and _Sue Pope_, May 29 2002 %E A071453 Edited and extended by _Christian G. Bower_, Nov 11 2002