Number of integer partitions of n whose length is not a semi-sum of the parts.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =4a(5) =6a(6) =8a(7) =12a(8) =16a(9) =23a(10) =28a(11) =41a(12) =52a(13) =71a(14) =89a(15) =122a(16) =151a(17) =200a(18) =246a(19) =321a(20) =398a(21) =510a(22) =620a(23) =794a(24) =968a(25) =1212a(26) =1474a(27) =1837a(28) =2219a(29) =2748