Number of partitions of 2*n into parts of two kinds.

Terms

a(0) =1a(1) =5a(2) =20a(3) =65a(4) =185a(5) =481a(6) =1165a(7) =2665a(8) =5822a(9) =12230a(10) =24842a(11) =49010a(12) =94235a(13) =177087a(14) =326015a(15) =589128a(16) =1046705a(17) =1831065a(18) =3157789a(19) =5374390a(20) =9035539a(21) =15018300a(22) =24697480a(23) =40210481a(24) =64854575a(25) =103679156a(26) =164363280a(27) =258508230a(28) =403531208a(29) =625425005