200676domain: NAppears in sequencesa(n) = Sum_{k=0..m} T(n,k) * T(n,k+1), where m=0 for n=1; m=n+1 for n >= 2; and T is given by A026148.at n=6A027330a(n) = 256*n^2 - n.at n=27A158010a(n) = 1024*n^2 - 2*n.at n=13A158420a(n) = 784*n^2 - 28.at n=15A158657