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 A131871 #6 Jul 31 2025 02:44:38 %S A131871 0,0,0,0,0,1,2,3,4,10,21,32,43,54,165,276,387,498,1109,2220,3331,4442, %T A131871 5553,16664,27775,38886,49997,111108,222219,333330,444441,555552, %U A131871 1666663,2777774,3888885,4999996,11111107,22222218,33333329,44444440,55555551,166666662 %N A131871 a(n) = A131766(n) / 18. %H A131871 <a href="/index/Rec#order_11">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1,0,0,0,0,0,0,100,-200,100). %Y A131871 Cf. A002266, A131766. %K A131871 nonn,easy %O A131871 0,7 %A A131871 _Paul Curtz_, Oct 05 2007 %E A131871 a(32) corrected and more terms from _Georg Fischer_, Jul 31 2025