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A152906
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Irregular triangle read by rows, numbers in A007318 repeated three times .
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1
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 4, 4, 4, 6, 6, 6, 4, 4, 4, 1, 1, 1, 1, 1, 1, 5, 5, 5, 10, 10, 10, 10, 10, 10, 5, 5, 5, 1, 1, 1, 1, 1, 1, 6, 6, 6, 15, 15, 15, 20, 20, 20, 15, 15, 15, 6, 6, 6, 1, 1, 1, 1, 1, 1, 7, 7, 7, 21, 21, 21, 35, 35
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,13
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COMMENTS
| Diagonal sums : A078467 .
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FORMULA
| Sum_{k, 0<=k<=2n}T(n,k)=3*2^(n).
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EXAMPLE
| Triangle begins : 1,1,1 ; 1,1,1,1,1,1 ; 1,1,1,2,2,2,1,1,1 ; 1,1,1,3,3,3,3,3,3,1,1,1, ; 1,1,1,4,4,4,6,6,6,4,4,4,1,1,1 ; 1,1,1,5,5,5,10,10,10,10,10,10,5,5,5,1,1,1 ; ...
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CROSSREFS
| Cf. A007318, A152905
Sequence in context: A025146 A067397 A080586 * A128522 A025454 A126061
Adjacent sequences: A152903 A152904 A152905 * A152907 A152908 A152909
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KEYWORD
| nonn,tabf
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AUTHOR
| Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 14 2008
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