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Search: id:A104580
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| A104580 |
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Tribonacci convolution triangle. |
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+0
1
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| 1, 1, 1, 2, 2, 1, 4, 5, 3, 1, 7, 12, 9, 4, 1, 13, 26, 25, 14, 5, 1, 24, 56, 63, 44, 20, 6, 1, 44, 118, 153, 125, 70, 27, 7, 1, 81, 244, 359, 336, 220, 104, 35, 8, 1, 149, 499, 819, 864, 646, 357, 147, 44, 9, 1, 274, 1010, 1830, 2144, 1800, 1134, 546, 200, 54, 10, 1, 504
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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First column is A000073(n+2). Row sums are A077939. Diagonal sums are A002478.
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FORMULA
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Riordan array (1/(1-x-x^2-x^3), x(1-x-x^2-x^3))
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EXAMPLE
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Rows begin {1},{1,1},{2,2,1},{4,5,3,1},{7,12,9,4,1},...
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CROSSREFS
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Sequence in context: A061436 A136787 A001404 this_sequence A106197 A105306 A064189
Adjacent sequences: A104577 A104578 A104579 this_sequence A104581 A104582 A104583
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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), Mar 16 2005
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