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Search: id:A119732
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| 1, 1, 1, 1, 2, 1, 1, 4, 4, 1, 1, 11, 20, 11, 1, 1, 67, 276, 276, 67, 1
(list; table; graph; listen)
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OFFSET
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0,5
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FORMULA
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T(n,k) = f(T(n-1,k-1)) + f(T(n-1,k))where f(n) = n*(n+1)/2 = A000217(n); T(0;0) = 1 ; T(n,k) = 0 if k<0 or if k>n.
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EXAMPLE
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Triangle begins:
1;
1, 1;
1, 2, 1;
1, 4, 4, 1;
1, 11, 20, 11, 1;
1, 67, 276, 276, 67, 1;
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CROSSREFS
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Cf. A007318.
Sequence in context: A155971 A154218 A078121 this_sequence A123521 A123246 A122518
Adjacent sequences: A119729 A119730 A119731 this_sequence A119733 A119734 A119735
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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), Jun 14 2006
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