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 A357416 #16 Mar 25 2025 13:29:23
%S A357416 0,1,1,2,2,3,3,4,8,11,13,26,46,81,169,284,482,857,1461,2548,4370,7917,
%T A357416 14181,25648,47330,87457,163291,302678,568974,1064393,1993805,3742588,
%U A357416 7030646,13231519,24871349,46994382,88657700,167876827,318263561,604694212,1150634498
%N A357416 Number of nonempty subsets of {1..n} whose elements have an even root mean square.
%H A357416 Max Alekseyev, <a href="/A357416/b357416.txt">Table of n, a(n) for n = 1..100</a>
%F A357416 a(n) = A339454(n) - A357415(n).
%e A357416 a(9) = 8 subsets: {2}, {4}, {6}, {8}, {1, 3, 5, 8, 9}, {3, 4, 5, 7, 9}, {1, 3, 5, 6, 8, 9} and {3, 4, 5, 6, 7, 9}.
%Y A357416 Cf. A339454, A357356, A357412, A357414, A357415.
%K A357416 nonn
%O A357416 1,4
%A A357416 _Ilya Gutkovskiy_, Sep 27 2022
%E A357416 a(24)-a(41) from _Alois P. Heinz_, Sep 27 2022