104046domain: NAppears in sequencesSort then Add, a(1)=15.at n=20A033898Sort then Add, a(1)=21.at n=19A033901Number of 2 X 2 matrices M with all terms in {1,...,n} and permanent(M) >= n.at n=18A212240Expansion of Product_{k>=1} (1 + x^(k*(k+1)/2))^(k*(k+1)/2).at n=49A298850