Number of subsets of {1,2,...,n} with the sum of reciprocals <= 1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =8a(5) =14a(6) =26a(7) =46a(8) =83a(9) =151a(10) =276a(11) =503a(12) =921a(13) =1689a(14) =3113a(15) =5730a(16) =10549a(17) =19441a(18) =35868a(19) =66209a(20) =122316a(21) =226157a(22) =418373a(23) =774394a(24) =1434130a(25) =2657246a(26) =4925837a(27) =9135444a(28) =16949660a(29) =31460444