Number of compositions (ordered partitions) of n into proper divisors of n.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =5a(5) =1a(6) =24a(7) =1a(8) =55a(9) =19a(10) =128a(11) =1a(12) =1627a(13) =1a(14) =741a(15) =449a(16) =5271a(17) =1a(18) =45315a(19) =1a(20) =83343a(21) =3320a(22) =29966a(23) =1a(24) =5105721a(25) =571a(26) =200389a(27) =26425a(28) =5469758a(29) =1