67564

Appears in sequences

• Fourth row of Pascal-(1,2,1) array A081577.at n=12A081584
• Structured octagonal anti-prism numbers.at n=27A100184
• Array read by antidiagonals: T(m,n) = number of maximal irredundant sets in the grid graph P_m X P_n.at n=48A291439
• Array read by antidiagonals: T(m,n) = number of maximal irredundant sets in the grid graph P_m X P_n.at n=51A291439
• Number of words of length n, over the alphabet {a,b,c}, which have an odd number of a's and the number of b's plus the number of c's is less than or equal to 3.at n=38A342159
• a(n) = Sum_{k=0..n} 3^k * binomial(n,k) * binomial(3*n,k).at n=4A387930