119287domain: NAppears in sequencesa(n) = 2*a(n-1) + 5*a(n-2), with a(0) = a(1) = 1.at n=10A002533a(n) = 5^n * T(n,7/5) where T is the Chebyshev polynomial of the first kind.at n=5A099141Column 5 of array in A226513.at n=6A226800Number of Motzkin paths of length n with no level steps at height 2.at n=15A252354