Number of generalizations of the partition 1^n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =12a(5) =31a(6) =89a(7) =303a(8) =1119a(9) =4649a(10) =20572a(11) =99241a(12) =502622a(13) =2725840a(14) =15424019a(15) =92211327a(16) =571446565a(17) =3716191974a(18) =24920512847a(19) =174169990243