2182752

Appears in sequences

• Number of aperiodic matrices of size n whose entries cover an initial interval of positive integers.at n=7A323869
• a(0) = 1; a(n) = (1/n) * Sum_{k=1..n} binomial(n,k)^2 * k * 6^(k-1) * a(n-k).at n=6A337597