19694622domain: NAppears in sequencesSum along upward diagonal of Pascal triangle to halfway point.at n=38A010754Sum along upward diagonal of Pascal triangle up to (but not including) halfway point.at n=38A010755Diagonal sums of triangle A099575.at n=36A099577a(n) = Sum_{k=0..n} binomial(3*n+k+2,n-k).at n=9A390238