a(n) is the length of the n-th row of A348575.

Terms

a(0) =9a(1) =28a(2) =100a(3) =3660a(4) =2a(5) =4a(6) =34a(7) =279a(8) =1342a(9) =24486a(10) =41a(11) =4a(12) =9a(13) =37a(14) =3373a(15) =30332a(16) =10768a(17) =89207a(18) =9888780a(19) =118322a(20) =103912a(21) =1083421a(22) =1095431404a(23) =1182371a(24) =33970573a(25) =116430219a(26) =3152744167a(27) =24330557a(28) =27560841783