Sum of the even-indexed parts of all partitions of n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =10a(5) =21a(6) =33a(7) =59a(8) =90a(9) =145a(10) =213a(11) =328a(12) =467a(13) =684a(14) =959a(15) =1361a(16) =1866a(17) =2588a(18) =3490a(19) =4741a(20) =6311a(21) =8422a(22) =11067a(23) =14579a(24) =18941a(25) =24630a(26) =31703a(27) =40788a(28) =52019a(29) =66315