88761domain: NAppears in sequencesNumber of indecomposable set partitions of [1..n] without singletons.at n=11A098742Triangle read by rows, T(n,k) for 0<=k<=n, generalizing A098742.at n=45A216916Numbers k such that (17*10^k - 41)/3 is prime.at n=22A291867Number of (undirected) paths in the n-book graph.at n=27A307921