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Search: id:A152907
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| A152907 |
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Irregular triangle read by rows, numbers in A007318 repeated four times . |
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+0
1
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| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 4, 4, 4, 4, 6, 6, 6, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 5, 5, 10, 10, 10, 10, 10, 10, 10, 10, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 6, 6, 6, 6, 15, 15, 15, 15, 20, 20
(list; graph; listen)
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OFFSET
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0,17
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FORMULA
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Sum_{k, 0<=k<=4n+3}T(n,k)=2^(n+2).
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EXAMPLE
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Triangle begins : 1,1,1,1 ; 1,1,1,1,1,1,1,1 ; 1,1,1,1,2,2,2,2,1,1,1,1 ; 1,1,1,1,3,3,3,3,3,3,3,3,1,1,1,1, ; 1,1,1,1,4,4,4,4,6,6,6,6,4,4,4,4,1,1,1,1 ; 1,1,1,1,5,5,5,5,10,10,10,10,10,10,10,10,5,5,5,5,1,1,1,1 ; ...
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CROSSREFS
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Cf. A007318, A152905, A152906
Sequence in context: A049241 A101080 A130836 this_sequence A078786 A102677 A145884
Adjacent sequences: A152904 A152905 A152906 this_sequence A152908 A152909 A152910
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KEYWORD
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nonn,tabf
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 14 2008
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