280560

Appears in sequences

• Number of length-n 0..5 arrays connected end-around, with no sequence of L<n elements immediately followed by itself (periodic "squarefree").at n=7A215225
• G.f.: exp( Sum_{n>=1} A002129(n^2)*x^n/n ), where A002129(n) is the excess of sum of odd divisors of n over sum of even divisors of n.at n=50A225925