First differences of indices of A000043.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =1a(6) =3a(7) =7a(8) =6a(9) =4a(10) =3a(11) =67a(12) =13a(13) =96a(14) =121a(15) =11a(16) =116a(17) =128a(18) =19a(19) =594a(20) =30a(21) =131a(22) =897a(23) =181a(24) =156a(25) =2033a(26) =3760a(27) =2105a(28) =1842a(29) =6961