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Search: id:A115356
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| A115356 |
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Matrix (1,x)+(x,x^2) in Riordan array notation. |
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+0
3
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| 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 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 A000034. Diagonal sums are A115357. Inverse is A115358.
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FORMULA
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Number triangle T(n, k)=if(n=k, 1, 0) OR if(n=2k+1, 1, 0).
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EXAMPLE
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Triangle begins
1;
1, 1;
0, 0, 1;
0, 1, 0, 1;
0, 0, 0, 0, 1;
0, 0, 1, 0, 0, 1;
0, 0, 0, 0, 0, 0, 1;
0, 0, 0, 1, 0, 0, 0, 1;
0, 0, 0, 0, 0, 0, 0, 0, 1;
0, 0, 0, 0, 1, 0, 0, 0, 0, 1;
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CROSSREFS
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Sequence in context: A133985 A143062 A074910 this_sequence A115359 A117906 A090678
Adjacent sequences: A115353 A115354 A115355 this_sequence A115357 A115358 A115359
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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), Jan 21 2006
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