517461

Appears in sequences

• a(n) = (4*n^2 + 2*n - 3)*(2*n - 1)*n/3.at n=21A058581
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-0100-1111 pattern in any orientation.at n=16A146797
• Number of nondecreasing arrangements of 7 numbers in -(n+5)..(n+5) with sum zero and not more than two numbers equal.at n=13A188240