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A357415
Number of nonempty subsets of {1..n} whose elements have an odd root mean square.
3
1, 1, 2, 2, 3, 3, 6, 6, 7, 9, 16, 26, 41, 85, 142, 254, 461, 825, 1454, 2506, 4535, 7987, 14352, 26178, 47861, 87945, 162486, 304864, 565217, 1064529, 1992628, 3742934, 7034489, 13214869, 24924676, 46926388, 88812537, 167903969, 318619708, 604909434, 1150800393
OFFSET
1,3
FORMULA
a(n) = A339454(n) - A357416(n).
EXAMPLE
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}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Sep 27 2022
EXTENSIONS
a(24)-a(41) from Alois P. Heinz, Sep 27 2022
STATUS
approved