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 A291328 #4 Aug 23 2017 09:43:43
%S A291328 1,1,2,1,3,1,4,3,5,1,6,1,7,5,8,1,9,1,10,7,11,3,12,5,13,9,14,3,15,3,16,
%T A291328 11,17,7,18,3,19,13,20,5,21,5,22,15,23,5,24,7,25,17,26,5,27,11,28,19,
%U A291328 29,7,30,7,31,21,32,13,33,7,34,23,35
%N A291328 The arithmetic function v+-(n,9).
%H A291328 Bela Bajnok, <a href="https://arxiv.org/abs/1705.07444">Additive Combinatorics: A Menu of Research Problems</a>, arXiv:1705.07444 [math.NT], May 2017. See Section 1.6.2.
%t A291328 vpm[n_, h_] := (d = Divisors[n]; Max[(2*Floor[(d - 2)/(2*h)] + 1)*n/d]); Table[vpm[n, 9], {n, 2, 70}]
%Y A291328 Cf. A289435, A289436, A289437, A289438, A289439, A289440, A289441, A290988.
%K A291328 nonn
%O A291328 2,3
%A A291328 _Robert Price_, Aug 22 2017