Column k=6 sequence of array A103728.

Terms

a(0) =1a(1) =191a(2) =853a(3) =7537a(4) =17587a(5) =71369a(6) =363749a(7) =574621a(8) =1895149a(9) =3744761a(10) =5123791a(11) =9167525a(12) =19974397a(13) =39789335a(14) =49243141a(15) =89502667a(16) =129269281a(17) =154098649a(18) =253600309a(19) =345942995a(20) =535842121a(21) =917491105a(22) =1180249901a(23) =1333475377