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Search: id:A119673
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| A119673 |
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Triangle read by rows, T(n, k) = 3*T(n-1, k-1)+T(n-1, k) for k<n and T(n, n) = 1 ; T(n, k) = 0= if k<0 or k>n. |
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+0
1
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| 1, 1, 1, 1, 4, 1, 1, 7, 13, 1, 1, 10, 34, 40, 1, 1, 13, 64, 142, 121, 1, 1, 16, 103, 334, 547, 364, 1, 1, 19, 151, 643, 1549, 2005, 1093, 1, 1, 22, 208, 1096, 3478, 6652, 7108, 3280, 1, 1, 25, 274, 1720, 6766, 17086, 27064, 24604, 9841, 1, 1, 28, 349, 2542, 11926
(list; table; graph; listen)
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OFFSET
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0,5
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EXAMPLE
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Triangle begins:
1
1 1
1 4 1
1 7 13 1
1 10 34 40 1
1 13 64 142 121 1
1 16 103 334 547 364 1
1 19 151 643 1549 2005 1093 1
1 22 208 1096 3478 6652 7108 3280 1
1 25 274 1720 6766 17086 27064 24604 9841 1
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CROSSREFS
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Cf. A081271, A003462, A014915, A119258.
Sequence in context: A047671 A081577 A073697 this_sequence A051455 A132789 A100754
Adjacent sequences: A119670 A119671 A119672 this_sequence A119674 A119675 A119676
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 11 2006
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EXTENSIONS
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Definition clarified by Philippe DELEHAM, Jun 13 2006
Entry revised by njas, Jun 19 2006
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