a(n) = Product_{k>=0} (1 + floor(n/2^k)).

Terms

a(0) =1a(1) =2a(2) =6a(3) =8a(4) =30a(5) =36a(6) =56a(7) =64a(8) =270a(9) =300a(10) =396a(11) =432a(12) =728a(13) =784a(14) =960a(15) =1024a(16) =4590a(17) =4860a(18) =5700a(19) =6000a(20) =8316a(21) =8712a(22) =9936a(23) =10368a(24) =18200a(25) =18928a(26) =21168a(27) =21952a(28) =27840a(29) =28800