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Search: id:A133569
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| 1, 1, 1, 2, 3, 1, 1, 3, 3, 1, 2, 7, 9, 5, 1, 1, 5, 10, 10, 5, 1, 2, 11, 25, 30, 20, 7, 1, 1, 7, 21, 35, 35, 21, 7, 1, 2, 15, 49, 91, 105, 77, 35, 9, 1, 1, 9, 36, 84, 126, 126, 84, 36, 9, 1
(list; table; graph; listen)
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OFFSET
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1,4
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COMMENT
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Row sums = A122756: (1, 2, 6, 8, 24, 32, 96,...).
With offset (0,4); triangle T(n,k), 0<=k<=n, given by [1,1,-3,1,0,0,0,0,0,0,0,...] DELTA [1,0,-2,1,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 15 2007
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EXAMPLE
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First few rows of the triangle are:
1;
1, 1;
2, 3, 1;
1, 3, 3, 1;
2, 7, 9, 5, 1;
1, 5, 10, 10, 5, 1;
2, 11, 25, 30, 20, 7, 1;
1, 7, 21, 35, 35, 21, 7, 1;
...
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CROSSREFS
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Cf. A133566, A122756.
Sequence in context: A067627 A077233 A123185 this_sequence A141071 A004648 A139438
Adjacent sequences: A133566 A133567 A133568 this_sequence A133570 A133571 A133572
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 16 2007
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