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A127773
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Triangle read by rows: row n consists of n-1 zeros followed by n(n+1)/2.
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11
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1, 0, 3, 0, 0, 6, 0, 0, 0, 10, 0, 0, 0, 0, 15, 0, 0, 0, 0, 0, 21, 0, 0, 0, 0, 0, 0, 28, 0, 0, 0, 0, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0, 0, 45, 0, 0, 0, 0, 0, 0, 0, 0, 0, 55
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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EXAMPLE
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First few rows of the triangle are:
1;
0, 3;
0, 0, 6;
0, 0, 0, 10;
0, 0, 0, 0, 15;
...
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MATHEMATICA
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Flatten[Table[{(n(n+1))/2, Table[0, {n}]}, {n, 10}]] (* Harvey P. Dale, Apr 03 2011 *)
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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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