Number of unbalanced partitions of n: the largest part is not equal to the number of parts.

Terms

a(0) =0a(1) =2a(2) =2a(3) =4a(4) =6a(5) =10a(6) =12a(7) =20a(8) =26a(9) =38a(10) =50a(11) =70a(12) =90a(13) =124a(14) =160a(15) =212a(16) =272a(17) =356a(18) =450a(19) =582a(20) =732a(21) =932a(22) =1166a(23) =1470a(24) =1824a(25) =2280a(26) =2814a(27) =3486a(28) =4280a(29) =5268