Number of pairs of two disjoint sets of n positive integers with product A354457(n).

Terms

a(0) =1a(1) =1a(2) =3a(3) =4a(4) =31a(5) =15a(6) =55a(7) =110a(8) =280a(9) =797a(10) =1419a(11) =3557a(12) =5647a(13) =19559a(14) =59708a(15) =360726a(16) =346487a(17) =2018032a(18) =2106172a(19) =13228494a(20) =13994982a(21) =65426469a(22) =110980446a(23) =257148638a(24) =660593345a(25) =1966842579a(26) =3909078573a(27) =20820932559a(28) =26864715089a(29) =144689720443