427570

Appears in sequences

• a(n) = 13*binomial(2n,n-6)/(n+7).at n=7A000590
• A simple context-free grammar: convolution cube of A001002.at n=12A052703
• Eighth column of Catalan triangle A009766.at n=12A064061
• Seventh column (m=6) of (1,3)-Pascal triangle A095660.at n=21A095662
• Indices k such that 9 plus the k-th triangular number is a perfect square.at n=13A154142