G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (1 - x^(n+k))/(1 - x^k).

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =5a(6) =8a(7) =10a(8) =15a(9) =20a(10) =28a(11) =36a(12) =50a(13) =64a(14) =86a(15) =110a(16) =145a(17) =184a(18) =238a(19) =300a(20) =384a(21) =481a(22) =608a(23) =756a(24) =948a(25) =1172a(26) =1456a(27) =1790a(28) =2208a(29) =2700