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Search: id:A123934
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| A123934 |
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Triangle T(n,k), 1<=k<=n :forms the odd-indexed trinomial coefficients (A027907). |
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+0
1
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| 1, 2, 2, 3, 7, 3, 4, 16, 16, 4, 5, 30, 51, 30, 5, 6, 50, 126, 126, 50, 6, 7, 77, 266, 393, 266, 77, 7
(list; table; graph; listen)
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OFFSET
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1,2
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FORMULA
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Sum_{k, 1<=k<=n}T(n,k)=A003462(n)=(3^n-1)/2.
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EXAMPLE
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Triangle begins:
1;
2, 2;
3, 7, 3;
4, 16, 16, 4;
5, 30, 51, 30, 5;
6, 50, 126, 126, 50, 6;
7, 77, 266, 393, 266, 77, 7;
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CROSSREFS
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Cf. A056241.
Sequence in context: A096100 A021451 A134232 this_sequence A051301 A002583 A068519
Adjacent sequences: A123931 A123932 A123933 this_sequence A123935 A123936 A123937
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KEYWORD
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nonn,tabl
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 30 2006
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