Sum of the even parts in the partitions of n into 4 parts.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =2a(6) =4a(7) =12a(8) =18a(9) =28a(10) =40a(11) =62a(12) =80a(13) =120a(14) =154a(15) =208a(16) =260a(17) =334a(18) =408a(19) =522a(20) =620a(21) =764a(22) =902a(23) =1090a(24) =1270a(25) =1512a(26) =1742a(27) =2042a(28) =2324a(29) =2694