A046087 Middle member 'b' of the primitive Pythagorean triples (a,b,c) ordered by increasing c, then b.

4, 12, 15, 24, 21, 35, 40, 45, 60, 56, 63, 55, 77, 84, 80, 72, 99, 91, 112, 117, 105, 143, 144, 140, 132, 120, 165, 180, 153, 176, 168, 195, 156, 187, 171, 220, 221, 208, 209, 255, 247, 264, 260, 252, 231, 240, 285, 224, 273, 312, 308, 253, 323, 288, 299, 272