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A045653
Number of 2n-bead balanced binary strings, rotationally equivalent to reverse.
6
1, 2, 6, 8, 38, 52, 216, 268, 1062, 1232, 4956, 5524, 21848, 24000, 95780, 102808, 410662, 437548, 1748592, 1847524, 7384988, 7759144, 31033404, 32449828, 129774936, 135207552, 540807104, 561629852, 2246432996, 2326762744, 9306937416, 9617286180, 38468731942
OFFSET
0,2
LINKS
FORMULA
Inverse Moebius transform of A045662. - Andrew Howroyd, Sep 15 2019
PROG
(PARI) c(n)={sumdiv(n, d, moebius(d)*d)} \\ A023900
a(n)={if(n<1, n==0, 2*sumdiv(n, d, c(n/d) * d * binomial(d-d%2, d\2)))} \\ Andrew Howroyd, Sep 15 2019
CROSSREFS
KEYWORD
nonn
EXTENSIONS
Terms a(30) and beyond from Andrew Howroyd, Sep 15 2019
STATUS
approved