74409

Appears in sequences

• a(0)=1, a(1)=1, a(n) = 3*a(n-1) + a(n-2) + 1.at n=10A033538
• a(n) = A000045(n) - A000931(n).at n=25A129973
• Position of 210^n among 7-smooth numbers A002473.at n=8A372401