Total number of inversions in all compositions of n into distinct parts.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =2a(6) =11a(7) =12a(8) =21a(9) =31a(10) =112a(11) =122a(12) =212a(13) =294a(14) =456a(15) =1147a(16) =1381a(17) =2144a(18) =3059a(19) =4494a(20) =6081a(21) =13597a(22) =15928a(23) =24716a(24) =33728a(25) =49260a(26) =65016a(27) =93229a(28) =169249a(29) =210206