三角形开头为:
1;
1, 1;
1, 3, 1;
1, 11, 11, 1;
1, 43, 140, 43, 1;
1, 159, 1244, 1244, 159, 1;
1, 551, 8779, 19954, 8779, 551, 1;
1, 1819, 54249, 236347, 236347, 54249, 1819, 1;
1, 5811, 309742, 2353021, 4440834, 2353021, 309742, 5811, 1;
1, 18167, 1684634, 21025310, 67447952, 67447952, 21025310, 1684634, 18167, 1;