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 A283339 #14 Mar 08 2017 06:57:36
%S A283339 1,-1,-256,-6305,-26335,1321887,32565169,276211695,-2659962750,
%T A283339 -111341327890,-1454216029918,-3323783801026,227018039015019,
%U A283339 4636828146319845,39615489757794355,-132865771935151820,-9075288352543844755,-132703303201618610765
%N A283339 Expansion of exp( Sum_{n>=1} -sigma_9(n)*x^n/n ) in powers of x.
%H A283339 Seiichi Manyama, <a href="/A283339/b283339.txt">Table of n, a(n) for n = 0..1000</a>
%F A283339 G.f.: Product_{n>=1} (1 - x^n)^(n^8).
%F A283339 a(n) = -(1/n)*Sum_{k=1..n} sigma_9(k)*a(n-k).
%Y A283339 Column k=8 of A283272.
%Y A283339 Cf. A023877 (exp( Sum_{n>=1} sigma_9(n)*x^n/n )).
%Y A283339 Cf. exp( Sum_{n>=1} -sigma_k(n)*x^n/n ): A010815 (k=1), A073592 (k=2), A283263 (k=3), A283264 (k=4), A283271 (k=5), A283336 (k=6), A283337 (k=7), A283338 (k=8), this sequence (k=9), A283340 (k=10).
%K A283339 sign
%O A283339 0,3
%A A283339 _Seiichi Manyama_, Mar 05 2017