Number of distinct prime signatures of the positive integers up to 2^n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =10a(6) =14a(7) =18a(8) =25a(9) =32a(10) =40a(11) =51a(12) =63a(13) =80a(14) =98a(15) =119a(16) =145a(17) =173a(18) =207a(19) =248a(20) =292a(21) =346a(22) =404a(23) =473a(24) =552a(25) =639a(26) =742a(27) =855a(28) =984a(29) =1129