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A124171
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Sequence obtained by reading the triangles shown below by rows.
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2
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1, 1, 2, 3, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 1, 2, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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EXAMPLE
| 1
1
2 3
1
2 3
4 5 6
1
2 3
4 5 6
7 8 9 10
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
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MAPLE
| A000217 := proc(n) n*(n+1)/2 ; end : for t from 1 to 10 do for i from 1 to A000217(t) do printf("%d, ", i) ; od ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 18 2007
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CROSSREFS
| See A115215 for another version.
Sequence in context: A194107 A071797 A025481 * A076645 A011448 A174981
Adjacent sequences: A124168 A124169 A124170 * A124172 A124173 A124174
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KEYWORD
| nonn,tabf,easy
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AUTHOR
| Colm Mulcahy (colm(AT)spelman.edu), Dec 05 2006
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 18 2007
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