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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; internal format)
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OFFSET
| 1,2
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COMMENTS
| Row sums = bin(n,4), (A000332): (1, 5, 15, 35,...).
Contribution from Clark Kimberling (ck(AT)evansville.edu), Sep 16 2008: (Start)
As a rectangular array: R=A000027*A000217; R(m,n)=n*C(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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FORMULA
| A004736 * A127773 as infinite lower triangular matrices.
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EXAMPLE
| First few rows of the triangle are:
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
| Cf. A004736, A127773, A000217, A000332.
Cf. A002260. [From Clark Kimberling (ck(AT)evansville.edu), Sep 16 2008]
Sequence in context: A186286 A023821 A075258 * A101437 A039856 A143715
Adjacent sequences: A127776 A127777 A127778 * A127780 A127781 A127782
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 28 2007
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