A051233 Number of unit squares at least 50% covered by a circle inscribed in an integer square of size n X n.

1, 4, 9, 12, 21, 32, 37, 52, 65, 80, 97, 112, 137, 152, 177, 208, 225, 256, 289, 316, 349, 384, 421, 448, 489, 536, 577, 612, 665, 716, 749, 812, 857, 912, 965, 1020, 1085, 1124, 1201, 1264, 1313