13125105

Appears in sequences

• A four product triangle sequence based on :a=2;f(n,a)=f(n - 1, a) + a*f(n - 2, a).at n=29A174187
• A four product triangle sequence based on :a=2;f(n,a)=f(n - 1, a) + a*f(n - 2, a).at n=34A174187