三角形开头为:
1;
1, 1;
1, 7, 1;
1, 27, 27, 1;
1, 87, 260, 87, 1;
1, 263, 1828, 1828, 263, 1;
1, 779, 11131, 24746, 11131, 779, 1;
1, 2299, 62793, 267515, 267515, 62793, 2299, 1;
1, 6799, 338902, 2529377, 4753074, 2529377, 338902, 6799, 1;
1, 20175, 1780242, 21935526, 70068408, 70068408, 21935526, 1780242, 20175, 1;