54166domain: NAppears in sequencesCycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite CLO = Cloverite starting with a T5 atom.at n=7A018999Sum_{k<=n} (sigma(k)^2), where sigma(k) denotes the sum of the divisors of k A000203.at n=37A072379