112352domain: NAppears in sequencesNumber of subsets of {1, ..., n} that are not double-free.at n=17A088808Number of set partitions of [n] such that the difference between each element and its index (in the partition) is a multiple of four.at n=17A274861Numbers k such that (142*10^k - 7)/9 is prime.at n=23A282256