143683domain: NAppears in sequencesa(n) = T(n, 2*n-6), T given by A027926.at n=21A027929a(n) = T(n,n-6), array T as in A055801.at n=43A055806a(n) = n^4 - 10n^3 + 35n^2 - 48n + 23.at n=21A137864a(n) = Sum_{k=0..floor(n/2)} binomial(4*n-k,n-2*k).at n=6A371743