a(n) = A000041(n) * A000070(n).

Terms

a(0) =1a(1) =2a(2) =8a(3) =21a(4) =60a(5) =133a(6) =330a(7) =675a(8) =1474a(9) =2910a(10) =5838a(11) =10920a(12) =20944a(13) =37673a(14) =68580a(15) =120384a(16) =211365a(17) =359964a(18) =614845a(19) =1022630a(20) =1701678a(21) =2776752a(22) =4517016a(23) =7232565a(24) =11557350a(25) =18201568a(26) =28579152a(27) =44373420a(28) =68634280a(29) =105109125