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 A160912 #9 Feb 08 2022 23:00:50
%S A160912 1,7,17,27,37,47,57,67,77,87,97,107,117,127,137,147,157,167,177,187,
%T A160912 197,207,217,227,237,247,257,267,277,287,297,307,317,327,337,347,357,
%U A160912 367,377,387,397,407,417,427,437,447
%N A160912 [1, 3, 5, 7, ...] convolved with [1, 4, 0, 0, 0, ...].
%H A160912 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2, -1).
%F A160912 Odd integers convolved with [1, 4, 0, 0, 0, ...].
%e A160912 a(3) = 17 = (5, 3, 1) * (1, 4, 0) = (5 + 12 + 0).
%t A160912 Table[ListConvolve[Range[1,2n-1,2],PadRight[{1,4},n,0]],{n,50}]//Flatten (* or *) Join[{1},Range[7,450,10]] (* or *) LinearRecurrence[{2,-1},{1,7,17},50] (* _Harvey P. Dale_, Apr 28 2018 *)
%Y A160912 Essentially a duplicate of A017353.
%K A160912 nonn
%O A160912 1,2
%A A160912 _Gary W. Adamson_, May 30 2009
%E A160912 More terms from _N. J. A. Sloane_, May 31 2009