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Search: id:A159800
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| A159800 |
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Triangle read by rows in which row n contains a finite triangle as shown below. |
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+0
6
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| 1, 1, 2, 2, 2, 3, 2, 1, 2, 2, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 3, 3, 4, 5, 4, 3, 2, 3, 4, 4, 3, 2, 1, 2, 3, 3, 3, 2, 1, 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 4, 4, 5, 6, 6, 5, 4, 4, 5, 6, 7, 6, 5, 4, 3, 4, 5, 6, 6, 5, 4, 3, 2, 3, 4, 5, 5, 5, 4, 3, 2, 1, 2, 3, 4, 4, 4, 4, 3, 2, 1, 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5
(list; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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The main triangle begins:
1,
1,2,2,2,3,2,1,2,2,1,
1,2,2,3,3,3,3,4,4,3,3,4,5,4,3,2,3,4,4,3,2,1,2,3,3,3,2,1,
1,2,2,3,3,3,4,4,4,4,4,5,5,5,4,4,5,6,6,5,4,4,5,6,7,6,5,4,3,4,5,6,6,5,4,3,...
In which row 1 contains a vertex, only:
1
Row 2 contains the triangle:
1
2,2
2,3,2
1,2,2,1
Row 3 contains the triangle:
1
2,2
3,3,3
3,4,4,3
3,4,5,4,3
2,3,4,4,3,2
1,2,3,3,3,2,1
Row 4 contains the triangle:
1
2,2
3,3,3
4,4,4,4
4,5,5,5,4
4,5,6,6,5,4
4,5,6,7,6,5,4
3,4,5,6,6,5,4,3
2,3,4,5,5,5,4,3,2
1,2,3,4,4,4,4,3,2,1
Row 5 contains the triangle:
1
2,2
3,3,3
4,4,4,4
5,5,5,5,5
5,6,6,6,6,5
5,6,7,7,7,6,5
5,6,7,8,8,7,6,5
5,6,7,8,9,8,7,6,5
4,5,6,7,8,8,7,6,5,4
3,4,5,6,7,7,7,6,5,4,3
2,3,4,5,6,6,6,6,5,4,3,2
1,2,3,4,5,5,5,5,5,4,3,2,1
And so on...
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CROSSREFS
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Sequence in context: A135151 A014843 A116987 this_sequence A071137 A089367 A130192
Adjacent sequences: A159797 A159798 A159799 this_sequence A159801 A159802 A159803
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KEYWORD
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easy,nonn,tabf
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Nov 09 2009
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