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Search: id:A103451
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| A103451 |
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Triangle read by rows: a binomial skeleton. |
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+0
25
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| 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
(list; table; graph; listen)
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OFFSET
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0,1
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COMMENT
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Row sums are A040000. Diagonal sums are A040001. Inverse is A103452.
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FORMULA
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Number triangle T(n, k)=if(k<=n, binomial(n, k)*0^(k(n-k)), 0); T(n, k)=if(k=0 or k=n, 1, 0).
a(n)=A097806(n-1), n>=1 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 16 2007
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EXAMPLE
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Rows start {1}, {1,1}, {1,0,1}, {1,0,0,1}, {1,0,0,0,1},...
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CROSSREFS
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Adjacent sequences: A103448 A103449 A103450 this_sequence A103452 A103453 A103454
Sequence in context: A054525 A065333 A127972 this_sequence A103452 A131219 A127970
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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), Feb 06 2005
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