20072

Appears in sequences

• Number of nonnegative solutions to x^2 + y^2 + z^2 < n^2.at n=33A218711
• Positions of 3's in A234323.at n=53A234804
• Fill an array by antidiagonals upwards; in the top left cell enter a(0)=1; thereafter, in the n-th cell, enter the sum of the entries of those earlier cells that can be seen from that cell.at n=26A279212