不规则三角形的开头为:
0;
-2, 1, 2;
0, 0, 0, 0, 0;
12, 5, 0, -3, -4, -3, 0;
40, 22, 8, -2, -8, -10, -8, -2, 8;
90, 57, 30, 9, -6, -15, -18, -15, -6, 9, 30;
168, 116, 72, 36, 8, -12, -24, -28, -24, -12, 8, 36, 72;
280, 205, 140, 85, 40, 5, -20, -35, -40, -35, -20, 5, 40, 85, 140;