Sum of the largest two parts in the partitions of 4n into 4 parts with smallest part equal to 1.

Terms

a(0) =2a(1) =23a(2) =93a(3) =243a(4) =492a(5) =878a(6) =1432a(7) =2165a(8) =3123a(9) =4337a(10) =5810a(11) =7596a(12) =9726a(13) =12195a(14) =15065a(15) =18367a(16) =22088a(17) =26298a(18) =31028a(19) =36257a(20) =42063a(21) =48477a(22) =55470a(23) =63128a(24) =71482a(25) =80495a(26) =90261a(27) =100811a(28) =112100a(29) =124230