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 A196221 #17 Jul 22 2025 12:50:05 %S A196221 1,99,5346,208494,6567561,177324147,4255779528,93019181112, %T A196221 1883638417518,35789129932842,644204338791156,11068601821048044, %U A196221 182631930047292726,2908062270753045714,44867246463046991016,673008696945704865240,9842752192830933654135,140693457815171581056165,1969708409412402134786310 %N A196221 Binomial(n+10, 10)*9^n. %H A196221 Vincenzo Librandi, <a href="/A196221/b196221.txt">Table of n, a(n) for n = 0..400</a> %F A196221 a(n) = C(n+10, 10)*9^n. %F A196221 G.f. -1 / (9*x-1)^11 . - R. J. Mathar, Oct 13 2011 %o A196221 (Magma) [Binomial(n+10, 10)*9^n: n in [0..20]]; %Y A196221 Cf. A053108, A081139, A173000, A173187, A173188, A173191, A173192. %K A196221 nonn,easy %O A196221 0,2 %A A196221 _Vincenzo Librandi_, Oct 13 2011