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 A023551 #23 Sep 08 2022 08:44:47 %S A023551 9,24,46,76,115,164,224,296,381,480,594,724,871,1036,1220,1424,1649, %T A023551 1896,2166,2460,2779,3124,3496,3896,4325,4784,5274,5796,6351,6940, %U A023551 7564,8224,8921,9656,10430,11244,12099,12996,13936,14920,15949 %N A023551 Self-convolution of natural numbers >= 3. %H A023551 Vincenzo Librandi, <a href="/A023551/b023551.txt">Table of n, a(n) for n = 1..10000</a> %H A023551 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4,-6,4,-1). %F A023551 a(n) = n*(n^2 + 15*n + 38)/6. - Robert Lester (RobertLester(AT)Earthlink.net), Jan 31 2005 %F A023551 G.f.: x*(3-2*x)^2/(1-x)^4. - _Bruno Berselli_, Oct 21 2011 %o A023551 (PARI) a(n) = n*(n^2+15*n+38)/6 \\ _Charles R Greathouse IV_, Oct 21 2011 %o A023551 (Magma) [n*(n^2+15*n+38)/6: n in [1..50]]; // _Vincenzo Librandi_, Oct 22 2011 %K A023551 nonn,easy %O A023551 1,1 %A A023551 _Clark Kimberling_