973843domain: NAppears in sequencesa(n)=(1/(4n))*sum(k=1,n,F(6k)*B(2n-2k)*binomial(2n,2k)) where F=Fibonacci numbers and B=Bernoulli numbers.at n=5A124125Number of subsets of {1..n} containing no differences or quotients of pairs of distinct elements.at n=33A326490