756388

Appears in sequences

• Antidiagonal sums of triangle A107105: a(n) = Sum_{k=0..n} A107105(n-k,k), where A107105(n,k) = C(n,k)*(C(n,k) + 1)/2.at n=17A107597
• a(n) = round(Product_{k=1..n} (1 + 1/2^2^(-k))).at n=20A383471