Number of sums S of distinct positive integers satisfying S <= n.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =9a(5) =13a(6) =18a(7) =24a(8) =32a(9) =42a(10) =54a(11) =69a(12) =87a(13) =109a(14) =136a(15) =168a(16) =206a(17) =252a(18) =306a(19) =370a(20) =446a(21) =535a(22) =639a(23) =761a(24) =903a(25) =1068a(26) =1260a(27) =1482a(28) =1738a(29) =2034