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Search: id:A131111
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| 1, 3, 1, 3, 6, 1, 3, 9, 9, 1, 3, 12, 18, 12, 1, 3, 15, 30, 30, 15, 1, 3, 18, 45, 60, 45, 18, 1, 3, 21, 63, 105, 105, 63, 21, 1, 3, 24, 84, 168, 210, 168, 84, 24, 1, 3, 27, 108, 252, 378, 378, 252, 108, 27, 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 = A033484: (1, 4, 10, 22, 46,...) = 3*2^n - 2.
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FORMULA
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3*A007318 - 2*I, where A007318 = Pascal's triangle, I = Identity matrix.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 1;
3, 6, 1;
3, 9, 9, 1;
3, 12, 18, 12, 1;
3, 15, 30, 30, 15, 1;
3, 18, 45, 60, 45, 18, 1;
...
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CROSSREFS
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Cf. A131110, A131112, A131113, A131114, A131115.
Sequence in context: A050820 A133179 A049324 this_sequence A128549 A055885 A096713
Adjacent sequences: A131108 A131109 A131110 this_sequence A131112 A131113 A131114
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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 15 2007
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