Number of sets of positive integers with arithmetic mean n.

Terms

a(0) =1a(1) =3a(2) =9a(3) =31a(4) =117a(5) =479a(6) =2061a(7) =9183a(8) =42021a(9) =196239a(10) =931457a(11) =4480531a(12) =21793257a(13) =107004891a(14) =529656765a(15) =2640160039a(16) =13241371629a(17) =66771501151a(18) =338333343825