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Search: id:A122431
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| A122431 |
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Riordan array ((1+x)^3,x). |
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+0
2
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| 1, 3, 1, 3, 3, 1, 1, 3, 3, 1, 0, 1, 3, 3, 1, 0, 0, 1, 3, 3, 1, 0, 0, 0, 1, 3, 3, 1, 0, 0, 0, 0, 1, 3, 3, 1, 0, 0, 0, 0, 0, 1, 3, 3, 1, 0, 0, 0, 0, 0, 0, 1, 3, 3, 1, 0, 0, 0, 0, 0, 0, 0, 1
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums are A115291. Diagonal sums are A113311. Inverse is A122432. Sequence array for C(3,n).
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FORMULA
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Number triangle T(n,k)=C(3,n-k)
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EXAMPLE
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Triangle begins
1,
3,1,
3,3,1,
1,3,3,1,
0,1,3,3,1,
0,0,1,3,3,1,
0,0,0,1,3,3,1,
0,0,0,0,1,3,3,1
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CROSSREFS
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Adjacent sequences: A122428 A122429 A122430 this_sequence A122432 A122433 A122434
Sequence in context: A075676 A124814 A122567 this_sequence A089607 A050141 A132752
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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 04 2006
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