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 A056838 #35 Aug 21 2024 12:26:53 %S A056838 0,0,0,1,1,2,4,5,7,9,11,13,16,18,21,25,28,32,36,40,44,49,53,58,64,69, %T A056838 75,81,87,93,100,106,113,121,128,136,144,152,160,169,177,186,196,205, %U A056838 215,225,235,245,256,266,277,289,300,312,324,336,348 %N A056838 a(n) = floor(n^2/9). %H A056838 Paolo Xausa, <a href="/A056838/b056838.txt">Table of n, a(n) for n = 0..10000</a> %H A056838 <a href="/index/Rec#order_11">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1,0,0,0,0,0,0,1,-2,1). %F A056838 G.f.: x^3*(1+x)*(x^2-x+1)^2/((1-x)^3*(1+x+x^2)(x^6+x^3+1)). [_R. J. Mathar_, Jan 05 2009] %t A056838 Floor[Range[0, 100]^2/9] (* _Paolo Xausa_, Aug 21 2024 *) %Y A056838 Cf. A008740. %Y A056838 Cf. A000290, A007590, A000212, A002620, A118015, A056827, A056834, A130519, A056865. %K A056838 nonn,easy %O A056838 0,6 %A A056838 _N. J. A. Sloane_, Sep 02 2000