Number of partitions of n such that there is exactly one part which occurs twice, while all other parts occur only once.

A090858

Number of partitions of n such that there is exactly one part which occurs twice, while all other parts occur only once.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =0a(4) =2a(5) =2a(6) =2a(7) =4a(8) =6a(9) =7a(10) =8a(11) =13a(12) =15a(13) =21a(14) =25a(15) =30a(16) =39a(17) =50a(18) =58a(19) =74a(20) =89a(21) =105a(22) =129a(23) =156a(24) =185a(25) =221a(26) =264a(27) =309a(28) =366a(29) =433

External references