564221981491domain: NAppears in sequencesa(n) = (6^n - 1)/5.at n=16A003464Modulo 2 binomial transform of 6^n.at n=15A100309a(n) = Sum_{j=0..15} n^j.at n=6A105312a(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=15A329018