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Search: id:A131226
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| 1, 3, 4, 1, 6, 7, 3, 4, 9, 10, 1, 6, 7, 12, 13, 3, 4, 9, 10, 15, 16, 1, 6, 7, 12, 13, 18, 19, 3, 4, 9, 10, 15, 16, 21, 22, 1, 6, 7, 12, 13, 18, 19, 24, 25, 3, 6, 9, 12, 15, 16, 21, 22, 27, 28
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = A095894: (1, 7, 14, 26, 39, 57,...). A131225 = 2*A002260 - A128174.
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FORMULA
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3*A002260 - 2*A128174 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 4;
1, 6, 7;
3, 4, 9, 10;
1, 6, 7, 12, 13;
3, 4, 9, 10, 15, 16;
1, 6, 7, 12, 13, 18, 19;
...
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CROSSREFS
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Cf. A095894, A002260, A128174, A131225.
Sequence in context: A030707 A132179 A089029 this_sequence A132700 A092261 A016607
Adjacent sequences: A131223 A131224 A131225 this_sequence A131227 A131228 A131229
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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 20 2007
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