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Search: id:A128077
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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; listen)
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OFFSET
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1,3
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COMMENT
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Row sums = the pentagonal numbers, A000326: 1, 5, 12, 22, 35, 51,...
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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 are:
1;
1, 4;
1, 2, 9;
1, 2, 3, 16;
1, 2, 3, 4, 25;
...
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CROSSREFS
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Cf. A128064, A002260, A000326, A128078.
Sequence in context: A081454 A133883 A004160 this_sequence A128078 A084604 A152253
Adjacent sequences: A128074 A128075 A128076 this_sequence A128078 A128079 A128080
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Feb 14 2007
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