Number of partitions of n such that (number of distinct parts) = number of 2's.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =1a(6) =1a(7) =2a(8) =2a(9) =2a(10) =4a(11) =4a(12) =6a(13) =9a(14) =10a(15) =12a(16) =19a(17) =21a(18) =24a(19) =36a(20) =44a(21) =49a(22) =66a(23) =81a(24) =100a(25) =123a(26) =144a(27) =180a(28) =229a(29) =265