-1562274

Appears in sequences

• Expansion of 1/((1 - x)^9 + x^9).at n=18A306942
• a(n) = Sum_{k=0..floor(n/9)} (-1)^k*binomial(n,9*k).at n=25A307045
• a(n) = Sum_{k=0..floor(n/9)} (-1)^k*binomial(n,9*k).at n=26A307045