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 A081128 #27 Jan 16 2024 06:56:13 %S A081128 0,1,24,432,6912,103680,1492992,20901888,286654464,3869835264, %T A081128 51597803520,681091006464,8916100448256,115909305827328, %U A081128 1497904875307008,19258776968232960,246512345193381888 %N A081128 12th binomial transform of (0,1,0,0,0,0,0,0,...). %H A081128 Vincenzo Librandi, <a href="/A081128/b081128.txt">Table of n, a(n) for n = 0..200</a> %H A081128 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (24,-144). %F A081128 a(n) = 24*a(n-1) - 132*a(n-2), a(0)=0, a(1)=1. %F A081128 a(n) = n*12^(n-1). %F A081128 G.f.: x/(1-12*x)^2. %F A081128 From _Amiram Eldar_, Oct 28 2020: (Start) %F A081128 Sum_{n>=1} 1/a(n) = 12*log(12/11). %F A081128 Sum_{n>=1} (-1)^(n+1)/a(n) = 12*log(13/12). (End) %F A081128 E.g.f.: x*exp(12*x). - _G. C. Greubel_, Jan 16 2024 %t A081128 a[n_]:=n*12^(n-1); a[Range[0,40]] (* _Vladimir Joseph Stephan Orlovsky_, Feb 09 2011 *) %o A081128 (Magma) [n*12^(n-1): n in [0..30]]; // _Vincenzo Librandi_, Jun 06 2011 %o A081128 (SageMath) [12^(n-1)*n for n in range(31)] # _G. C. Greubel_, Jan 16 2024 %Y A081128 Cf. A038327, A053541, A081127. %K A081128 easy,nonn %O A081128 0,3 %A A081128 _Paul Barry_, Mar 07 2003