118920

Appears in sequences

• Triangle, read by rows, where T(n,k) = Sum_{i=k..n-1} T(n-1,i)*T(i+1,k+1) for n>k with T(n,n) = n+1 for n>=0.at n=31A152541
• Numbers k such that 457*2^k+1 is prime.at n=16A323198