序列的开头为表：
1, 3, 6, 10, 15, 21, 28, ...
4, 7, 11, 16, 22, 29, 37, ...
8, 12, 17, 23, 30, 38, 47, ...
13, 18, 24, 31, 39, 48, 58, ...
19, 25, 32, 40, 49, 59, 70, ...
26, 33, 41, 50, 60, 71, 83, ...
34, 42, 51, 61, 72, 84, 97, ...
...
序列的开头为按行读取的三角形数组：
1;
3, 4;
6, 7, 8;
10, 11, 12, 13;
15, 16, 17, 18, 19;
21, 22, 23, 24, 25, 26;
28, 29, 30, 31, 32, 33, 34;
...
行号r包含r个数字r*（r+1）/2，r*（r+1）/2+1。..，r*（r+1）/2+r-1。（结束）
