Difference between the number of odd parts and the number of even parts in all the partitions of n.

Terms

a(0) =1a(1) =1a(2) =4a(3) =4a(4) =10a(5) =13a(6) =24a(7) =30a(8) =52a(9) =68a(10) =105a(11) =137a(12) =202a(13) =264a(14) =376a(15) =485a(16) =669a(17) =864a(18) =1162a(19) =1486a(20) =1968a(21) =2501a(22) =3256a(23) =4110a(24) =5285a(25) =6630a(26) =8434a(27) =10511a(28) =13241a(29) =16417