74020domain: NAppears in sequencesNumber of factorizations with 3 levels of parentheses indexed by prime signatures. A050340(A025487).at n=34A050341Number of ways to split 1, 2, 3, ..., 8n into n arithmetic progressions each with 8 terms.at n=14A104434G.f.: Product_{k>=1, j>=1} ((1 + x^(k*j)) / (1 - x^(k*j)))^2.at n=11A320237