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 A357415 #16 Mar 25 2025 13:29:55
%S A357415 1,1,2,2,3,3,6,6,7,9,16,26,41,85,142,254,461,825,1454,2506,4535,7987,
%T A357415 14352,26178,47861,87945,162486,304864,565217,1064529,1992628,3742934,
%U A357415 7034489,13214869,24924676,46926388,88812537,167903969,318619708,604909434,1150800393
%N A357415 Number of nonempty subsets of {1..n} whose elements have an odd root mean square.
%H A357415 Max Alekseyev, <a href="/A357415/b357415.txt">Table of n, a(n) for n = 1..100</a>
%F A357415 a(n) = A339454(n) - A357416(n).
%e A357415 a(10) = 9 subsets: {1}, {3}, {5}, {7}, {9}, {1, 7}, {1, 5, 7}, {2, 3, 6, 8, 9, 10} and {2, 3, 6, 7, 8, 9, 10}.
%Y A357415 Cf. A339454, A357355, A357411, A357413, A357416.
%K A357415 nonn
%O A357415 1,3
%A A357415 _Ilya Gutkovskiy_, Sep 27 2022
%E A357415 a(24)-a(41) from _Alois P. Heinz_, Sep 27 2022