15997240

Appears in sequences

• A four product triangle sequence based on :a=3;f(n,a)=f(n - 1, a) + a*f(n - 2, a).at n=22A174188
• A four product triangle sequence based on :a=3;f(n,a)=f(n - 1, a) + a*f(n - 2, a).at n=26A174188