Number of 7-element nondividing subsets of {1, 2, ..., n}.

Terms

a(0) =1a(1) =1a(2) =3a(3) =3a(4) =5a(5) =5a(6) =9a(7) =12a(8) =21a(9) =27a(10) =41a(11) =46a(12) =74a(13) =99a(14) =137a(15) =153a(16) =203a(17) =307a(18) =414a(19) =464a(20) =612a(21) =788a(22) =1126a(23) =1292a(24) =1645a(25) =2039a(26) =2614a(27) =3291a(28) =4120a(29) =5127