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A152905
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Irregular triangle read by rows, numbers in A007318 repeated .
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2
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1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 4, 4, 6, 6, 4, 4, 1, 1, 1, 1, 5, 5, 10, 10, 10, 10, 5, 5, 1, 1, 1, 1, 6, 6, 15, 15, 20, 20, 15, 15, 6, 6, 1, 1, 1, 1, 7, 7, 21, 21, 35, 35, 35, 35, 21, 21, 7, 7, 1, 1, 1, 1, 88, 28, 28, 56, 56, 70, 70, 56, 56, 28, 28, 8, 8, 1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,9
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COMMENTS
| Diagonal sums : A097333 .
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FORMULA
| Sum_{k, 0<=k<=2n}T(n,k)=2^(n+1).
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EXAMPLE
| Triangle begins : 1,1 ; 1,1,1,1 ; 1,1,2,2,1,1 ; 1,1,3,3,3,3,1,1, ; 1,1,4,4,6,6,4,4,1,1 ; 1,1,5,5,10,10,10,10,5,5,1,1 ; ...
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CROSSREFS
| Cf. A000079,
Sequence in context: A206474 A175025 A076899 * A096601 A078077 A078082
Adjacent sequences: A152902 A152903 A152904 * A152906 A152907 A152908
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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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