OFFSET
1,3
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