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1, 2, 3, 3, 6, 6, 4, 9, 12, 10, 5, 12, 18, 20, 15, 6, 15, 24, 30, 30, 21, 7, 18, 30, 40, 45, 42, 28, 8, 21, 36, 50, 60, 63, 56, 36, 9, 24, 42, 60, 75, 84, 84, 72, 45
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Row sums = bin(n,4), (A000332): (1, 5, 15, 35, ...).
From Clark Kimberling, Sep 16 2008: (Start)
As a rectangular array: R = A000027*A000217; R(m,n) = n*binomial(m+1,2).
A127779 (rectangular) is the accumulation array (cf. A144112) of A002260 (rectangular, with n-th row (n,n,n,n,...). (End)
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LINKS
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Table of n, a(n) for n=1..45.
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FORMULA
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A004736 * A127773 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle:
1;
2, 3;
3, 6, 6;
4, 9, 12, 10;
5, 12, 18, 20, 15;
6, 15, 24, 30, 30, 21;
7, 18, 30, 40, 45, 42, 28;
...
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CROSSREFS
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Cf. A004736, A127773, A000217, A000332.
Cf. A002260. - Clark Kimberling, Sep 16 2008
Sequence in context: A075258 A321745 A212629 * A207634 A222862 A101437
Adjacent sequences: A127776 A127777 A127778 * A127780 A127781 A127782
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson, Jan 28 2007
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STATUS
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approved
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