Sum of the leftmost parts in all compositions of n into distinct parts.

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =8a(5) =15a(6) =30a(7) =42a(8) =64a(9) =99a(10) =190a(11) =242a(12) =384a(13) =533a(14) =798a(15) =1380a(16) =1824a(17) =2635a(18) =3762a(19) =5320a(20) =7280a(21) =12327a(22) =15554a(23) =22632a(24) =30720a(25) =43425a(26) =57538a(27) =80730a(28) =122920a(29) =159239