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 A218027 #13 May 08 2019 22:18:06 %S A218027 0,1,1,1,1,1,1,1,1,1,1,1,2,3,5,7,11,15,22,30,42,56,78,104,143,193,266, %T A218027 362,503,693,969,1349,1896,2656,3746,5267,7436,10476,14798,20869, %U A218027 29491,41635,58878,83234,117841,166851,236568,335526,476451,676868,962566 %N A218027 Shifts 10 places left under Euler transform with a(0)=0 and a(n)=1 for n<10. %H A218027 Alois P. Heinz, <a href="/A218027/b218027.txt">Table of n, a(n) for n = 0..1000</a> %H A218027 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %F A218027 G.f.: x + x^2 + x^3 + x^4 + x^5 + x^6 + x^7 + x^8 + x^9 + x^10 / Product_{n>=1} (1 - x^n)^a(n). - _Ilya Gutkovskiy_, May 08 2019 %p A218027 with(numtheory): %p A218027 b:= proc(n) option remember; `if`(n=0, 1, %p A218027 (add(add(d*a(d), d=divisors(j)) *b(n-j), j=1..n))/n) %p A218027 end: %p A218027 a:= n-> `if`(n<10, signum(n), b(n-10)): %p A218027 seq(a(n), n=0..60); %Y A218027 Column k=10 of A144018. %Y A218027 Cf. A316082. %K A218027 nonn,eigen %O A218027 0,13 %A A218027 _Alois P. Heinz_, Oct 18 2012