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EXAMPLE
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The structure of this irregular triangle is shown below:
a, b, c, b, c;
a, b, c, b, c;
a, b, c, b, c, a, b, c, b, c;
a, b, c, b, c, a, b, c, b, c, a, b, c, b, c, a, b, c, b, c;
...
So, written as an irregular triangle in which the row lengths are the terms of A011782 multiplied by 5, the sequence begins:
1, 2, 4, 6, 8;
6, 6, 10, 16, 20;
12, 10, 16, 20, 32, 24, 22, 34, 36, 40;
16, 14, 20, 24, 40, 32, 32, 44, 48, 64, 48, 42, 58, 70, 104, 74, 60, 78, 78, 80;
24, 14, 20, 24, 40, 36, 40, 50, 52, 72, ...
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