91140

Appears in sequences

• Number of n X n 0..4 arrays with row sums 10 and column sums 10.at n=3A172800
• Number of n X n 0..4 arrays with row sums 6 and column sums 6.at n=3A172811
• Triangle T(n,k) read by rows: the number of n X n {0,1} matrices with trace k where each row sum and each column sum is 2.at n=33A284989
• Number of triangles larger than size=1 in a matchstick-made hexagon with side length n.at n=30A307253
• Sum of piles of first n primes: a(n) = Sum(prime(i)*(2*i-1): 1<=i<=n).at n=32A316322
• Triangular array read by rows: row n shows the coefficients of the polynomial p(x,n) constructed as in Comments; these polynomials form a strong divisibility sequence.at n=22A327322