Generating function = Product_{m>=1} 1/(1 - x^m)^2; a(n) = number of partitions of n into parts of 2 kinds.

A000712

Generating function = Product_{m>=1} 1/(1 - x^m)^2; a(n) = number of partitions of n into parts of 2 kinds.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =10a(4) =20a(5) =36a(6) =65a(7) =110a(8) =185a(9) =300a(10) =481a(11) =752a(12) =1165a(13) =1770a(14) =2665a(15) =3956a(16) =5822a(17) =8470a(18) =12230a(19) =17490a(20) =24842a(21) =35002a(22) =49010a(23) =68150a(24) =94235a(25) =129512a(26) =177087a(27) =240840a(28) =326015a(29) =439190

External references