Number of different products (including the empty product) of any subset of {1, 2, 3, ..., n}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =26a(7) =52a(8) =88a(9) =152a(10) =238a(11) =476a(12) =648a(13) =1296a(14) =2016a(15) =2984a(16) =4232a(17) =8464a(18) =11360a(19) =22720a(20) =30544a(21) =43744a(22) =67072a(23) =134144a(24) =166336a(25) =242752a(26) =370992a(27) =498144a(28) =656832a(29) =1313664