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1, 1, 4, 1, 2, 9, 1, 2, 3, 16, 1, 2, 3, 4, 25, 1, 2, 3, 4, 5, 36, 1, 2, 3, 4, 5, 6, 49, 1, 2, 3, 4, 5, 6, 7, 64
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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COMMENTS
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Row sums = the pentagonal numbers, A000326: 1, 5, 12, 22, 35, 51, ...
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LINKS
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FORMULA
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A128064 * A002260 as infinite lower triangular matrices. Triangle read by rows, a(1) = 1; n-th row = first (n-1) terms of (1, 2, 3, ...) followed by n^2.
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EXAMPLE
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First few rows of the triangle:
1;
1, 4;
1, 2, 9;
1, 2, 3, 16;
1, 2, 3, 4, 25;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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