Number of distinct sums <= 1 of reciprocals of positive integers <= n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =10a(5) =26a(6) =34a(7) =103a(8) =175a(9) =393a(10) =599a(11) =2015a(12) =2551a(13) =8681a(14) =14254a(15) =19620a(16) =34700a(17) =129557a(18) =161272a(19) =595304a(20) =695175a(21) =1094164a(22) =1903859a(23) =7654850a(24) =9413484a(25) =29625309