57867

Appears in sequences

• a(n) = 81*n^2 - 44*n + 6.at n=27A156676
• G.f.: Sum_{n>=0} x^n/(1-x)^(4*n) * Sum_{k=0..n} C(n,k)^2 * x^k.at n=8A249792
• Number of (n+1)X(7+1) 0..1 arrays with every 2X2 subblock antidiagonal maximum minus diagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal minimum nondecreasing vertically.at n=18A253396
• Triangle read by rows: T(n, k) is the number of parking functions of length n with preferences restricted to {1, ..., k} for 0 <= k <= n.at n=40A373086