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A134402
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Triangle read by rows, for n>0, n zeros followed by n.
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2
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1, 0, 1, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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COMMENTS
| Multiplied by [1, 2, 3,...] gives (1, 2, 6, 12, 20, 30, 42,...).
Triangle T(n,k), read by rows, given by [0,0,0,0,0,0,0,...] DELTA [1,1,-1,1,0,0,0,0,0,...] where DELTA is the operator defined in A084938 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 26 2007
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FORMULA
| Triangle read by rows, a(0) = 1, then for n>0, n zeros followed by n. Infinite lower triangular matrix with (1, 1, 2, 3, 4,...) in the main diagonal and the rest zeros.
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EXAMPLE
| First few rows of the triangle are:
1;
0, 1;
0, 0, 2;
0, 0, 0, 3;
0, 0, 0, 0, 4;
0, 0, 0, 0, 0, 5;
...
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CROSSREFS
| Cf. A134403, A005449.
Sequence in context: A173956 A083927 A154724 * A132440 A174712 A127647
Adjacent sequences: A134399 A134400 A134401 * A134403 A134404 A134405
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 23 2007
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