50620

Appears in sequences

• a(n) = 2025*n^2 - n.at n=4A156855
• Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=20A300084
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A384575.at n=52A384583