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例子
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数组的前几行开始:
[0] 1, 0, 0, 0, 0, 0, 0, 0, 0, ...A000007号
[1] 1, 1, 2, 5, 15, 52, 203, 877, 4140, ...A000110号
[2] 1, 2, 6, 22, 92, 426, 2146, 11624, 67146, ...A074664号
[3] 1, 3, 12, 57, 303, 1752, 10845, 71139, 491064, ...A321959型
[4] 1, 4, 20, 116, 744, 5140, 37676, 290224, 2334300, ...
[5] 1, 5, 30, 205, 1535, 12300, 103975, 918785, 8434740, ...
[6] 1, 6, 42, 330, 2820, 25662, 245358, 2443272, 25188870, ...
[7] 1, 7, 56, 497, 4767, 48496, 516761, 5719399, 65369136, ...
视为三角形:
[0] 1;
[1] 0, 1;
[2] 0, 1, 1;
[3] 0, 2, 2, 1;
[4] 0, 5, 6, 3, 1;
[5] 0, 15, 22, 12, 4, 1;
[6] 0, 52, 92, 57, 20, 5, 1;
[7] 0, 203, 426, 303, 116, 30, 6, 1;
[8] 0, 877, 2146, 1752, 744, 205, 42, 7, 1;
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