Number of strict integer partitions of 2n not containing n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =8a(6) =12a(7) =18a(8) =27a(9) =39a(10) =55a(11) =78a(12) =108a(13) =148a(14) =201a(15) =270a(16) =359a(17) =475a(18) =623a(19) =811a(20) =1050a(21) =1351a(22) =1728a(23) =2201a(24) =2789a(25) =3517a(26) =4418a(27) =5527a(28) =6887a(29) =8553