647113502847domain: NAppears in sequencesMaximum value in the distribution by first value of Prufer code of noncrossing spanning trees on a circle of n+2 points; perhaps the number whose Prufer code starts with 2.at n=16A056096a(n) = (1/(2*n+1)) * Sum_{k=0..n} (k+1)^3 * (2*k+1) * binomial(3*n-k,n-k).at n=15A390969