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Search: id:A131240
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| 1, 2, 1, 2, 2, 1, 2, 4, 2, 1, 2, 4, 6, 2, 1, 2, 6, 6, 8, 2, 12, 6, 12, 8, 10, 2, 1, 2, 8, 12, 20, 10, 12, 2, 1, 2, 8, 20, 20, 30, 12, 14, 2, 1, 2, 10, 20, 40, 30, 42, 14, 16, 2, 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 = A001595: (1, 3, 5, 9, 15, 25, 41, 67,...). A131241 = 3*A046854 - 2*I.
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FORMULA
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2*A046854 - Identity matrix, where A046854 = Pascal's triangle with repeats by columns.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 1;
2, 2, 1;
2, 4, 2, 1;
2, 4, 6, 2, 1;
2, 6, 6, 8, 2, 1;
2, 6, 12, 8, 10, 2, 1;
...
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CROSSREFS
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Cf. A001595, A046854, A131241.
Sequence in context: A132749 A140186 A078498 this_sequence A107027 A107030 A050362
Adjacent sequences: A131237 A131238 A131239 this_sequence A131241 A131242 A131243
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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), Jun 21 2007
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