Sum of the next to smallest parts in the partitions of 4n into 4 parts with smallest part = 1.

Terms

a(0) =1a(1) =5a(2) =17a(3) =42a(4) =78a(5) =134a(6) =215a(7) =315a(8) =447a(9) =616a(10) =812a(11) =1052a(12) =1341a(13) =1665a(14) =2045a(15) =2486a(16) =2970a(17) =3522a(18) =4147a(19) =4823a(20) =5579a(21) =6420a(22) =7320a(23) =8312a(24) =9401a(25) =10557a(26) =11817a(27) =13186a(28) =14630a(29) =16190