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 A022277 #39 Sep 08 2022 08:44:46
%S A022277 0,10,39,87,154,240,345,469,612,774,955,1155,1374,1612,1869,2145,2440,
%T A022277 2754,3087,3439,3810,4200,4609,5037,5484,5950,6435,6939,7462,8004,
%U A022277 8565,9145,9744,10362,10999,11655,12330,13024,13737,14469,15220,15990,16779,17587,18414
%N A022277 a(n) = n*(19*n + 1)/2.
%H A022277 G. C. Greubel, <a href="/A022277/b022277.txt">Table of n, a(n) for n = 0..5000</a>
%H A022277 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1).
%F A022277 a(n) = 19*n + a(n-1) - 9 for n>0, a(0)=0. - _Vincenzo Librandi_, Aug 04 2010
%F A022277 G.f.: x*(10 + 9*x)/(1 - x)^3. - _Vincenzo Librandi_, Mar 31 2015
%F A022277 a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>2. - _Vincenzo Librandi_, Mar 31 2015
%F A022277 a(n) = A022276(-n). - _Bruno Berselli_, Apr 01 2015
%F A022277 a(n) = A000217(10*n) - A000217(9*n). - _Bruno Berselli_, Oct 13 2016
%F A022277 E.g.f.: (x/2)*(19*x + 20)*exp(x). - _G. C. Greubel_, Aug 23 2017
%t A022277 Table[n (19 n + 1)/2, {n, 0, 100}] (* _Vladimir Joseph Stephan Orlovsky_, Mar 07 2011 *)
%t A022277 CoefficientList[Series[x (10 + 9 x) / (1 - x)^3, {x, 0, 40}], x] (* _Vincenzo Librandi_, Mar 31 2015 *)
%t A022277 LinearRecurrence[{3,-3,1},{0,10,39},50] (* _Harvey P. Dale_, May 02 2021 *)
%o A022277 (PARI) a(n)=n*(19*n+1)/2 \\ _Charles R Greathouse IV_, Mar 07 2011
%o A022277 (Magma) [n*(19*n + 1)/2: n in [0..45]]; // _Vincenzo Librandi_, Mar 31 2015
%Y A022277 Cf. A022276.
%Y A022277 Cf. similar sequences listed in A022289.
%K A022277 nonn,easy
%O A022277 0,2
%A A022277 _N. J. A. Sloane_
%E A022277 More terms from _Vincenzo Librandi_, Mar 31 2015