4121947domain: NAppears in sequencesa(n) = Sum_{k=m..n} T(k,n-k), where m = floor((n+1)/2); a(n) is the n-th diagonal-sum of left justified array T given by A027948.at n=38A027959a(n) = 3*a(n-1)-3*a(n-2)+a(n-3)+a(n-4).at n=25A138653