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Search: id:A122851
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| A122851 |
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Number triangle T(n,k)=C(k,n-k)*(n-k)!. |
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+0
2
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| 1, 0, 1, 0, 1, 1, 0, 0, 2, 1, 0, 0, 2, 3, 1, 0, 0, 0, 6, 4, 1, 0, 0, 0, 6, 12, 5, 1, 0, 0, 0, 0, 24, 20, 6, 1, 0, 0, 0, 0, 24, 60, 30, 7, 1, 0, 0, 0, 0, 0, 120, 120, 42, 8, 1, 0, 0
(list; table; graph; listen)
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OFFSET
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0,9
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COMMENT
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Row sums are A122852.
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FORMULA
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Number triangle T(n,k)=[k<=n]*k!/(2k-n)!
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EXAMPLE
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Triangle begins
1,
0, 1,
0, 1, 1,
0, 0, 2, 1,
0, 0, 2, 3, 1,
0, 0, 0, 6, 4, 1,
0, 0, 0, 6, 12, 5, 1,
0, 0, 0, 0, 24, 20, 6, 1
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CROSSREFS
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Cf. A094587.
Sequence in context: A122856 A055791 A120730 this_sequence A064301 A060701 A063181
Adjacent sequences: A122848 A122849 A122850 this_sequence A122852 A122853 A122854
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Sep 14 2006
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