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 A316984 #11 Dec 14 2019 15:08:58
%S A316984 0,1,6,16,55,488,314,367,279,562,519,799,500,694,792,876,1322,1598,
%T A316984 5826,1814,6102,5345,2042,5105,2949,3288,5260,4971,6353,5172,8596,
%U A316984 3193,6528,8065,8194,6538,6881,6966,7963,5993,8114,9090,8457,8948,12703,9994,6568
%N A316984 a(n) is the index of the last occurrence of n in A316774.
%C A316984 [It may be that these values are only conjectural. If so, the b-file should be changed to an a-file and marked as conjectured. - _N. J. A. Sloane_, Dec 14 2019]
%H A316984 Alois P. Heinz, <a href="/A316984/b316984.txt">Table of n, a(n) for n = 0..5000</a>
%F A316984 a(n) = max { j >= 0 : A316774(j) = n }.
%e A316984 a(4) = 55 because A316774(j) = 4 for j in {4,7,12,13,36,49,55} with maximal element 55.
%Y A316984 Cf. A316774, A316905, A316973.
%K A316984 nonn,look
%O A316984 0,3
%A A316984 _Alois P. Heinz_, Jul 18 2018