15672832819domain: NAppears in sequencesa(n) = (6^n - 1)/5.at n=14A003464a(n) = Sum_{j=0..13} n^j.at n=6A104376a(n) = p(1,n), where p(x,n) is the strong divisibility sequence of polynomials based on sqrt(3/2) as in A328644.at n=13A329018a(n) = floor(A026532(n)/5).at n=28A329114a(n) = floor(A026549(n)/5).at n=28A329115