Number of nonempty subsets of {1, 1/2, 1/3, ..., 1/n} that sum to an integer.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =3a(7) =3a(8) =3a(9) =3a(10) =3a(11) =5a(12) =5a(13) =5a(14) =11a(15) =11a(16) =11a(17) =21a(18) =21a(19) =43a(20) =43a(21) =43a(22) =43a(23) =83a(24) =83a(25) =83a(26) =83a(27) =255a(28) =255a(29) =449