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 A176592 #19 Jul 30 2025 09:46:46
%S A176592 1,11,2,22,3,33,4,44,5,55,6,66,7,77,8,88,9,99,10,110,11,121,12,132,13,
%T A176592 143,14,154,15,165,16,176,17,187,18,198,19,209,20,220,21,231,22,242,
%U A176592 23,253,24,264,25,275,26,286,27,297,28,308,29,319,30,330,31,341,32,352
%N A176592 List of pairs n, 11*n.
%H A176592 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,2,0,-1).
%F A176592 a(n) = (1/4)*(12*n+10*n*(-1)^n+1+(-1)^(n-1)) for n > 1, with a(1) = 1. (corrected by _Jon E. Schoenfield_, Jun 19 2010)
%F A176592 G.f.: x*(1+11*x)/(-1+x^2)^2. - _Harvey P. Dale_, Jul 27 2021
%t A176592 Flatten[Table[{n,11n},{n,40}]] (* or *) LinearRecurrence[{0,2,0,-1},{1,11,2,22},80] (* _Harvey P. Dale_, Nov 25 2015 *)
%K A176592 nonn,tabf,easy
%O A176592 1,2
%A A176592 _Vincenzo Librandi_, Apr 23 2010
%E A176592 Partially edited by _N. J. A. Sloane_, Jun 23 2010