66338

Appears in sequences

• Positive numbers whose square starts and ends with exactly 44, and no 444.at n=13A348831
• Array read by downward antidiagonals: A(n,k) = Sum_{i=0..n-1} Sum_{j=0..k+1} binomial(n-1,i)*binomial(k+1,j)*A(i,j) with A(0,k) = 1, n >= 0, k >= 0.at n=33A383410