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1, 3, 1, 3, 3, 1, 3, 6, 3, 1, 3, 6, 9, 3, 1, 3, 9, 9, 12, 3, 1, 3, 9, 18, 12, 15, 3, 1, 3, 12, 18, 30, 15, 18, 3, 1, 3, 12, 30, 30, 45, 18, 21, 3, 1, 3, 15, 30, 60, 45, 63, 21, 24, 3, 1
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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Row sums = A111314: (1, 4, 7, 13, 22, 37,...). A131240 = 2*A046854 - I.
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LINKS
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Table of n, a(n) for n=0..54.
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FORMULA
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3*A046854 - 2*I, where A046854 = Pascal's triangle with repeats by columns and I = Identity matrix.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 1;
3, 3, 1;
3, 6, 3, 1;
3, 6, 9, 3, 1;
3, 9, 9, 12, 3, 1
3, 9, 18, 12, 15, 3, 1;
...
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CROSSREFS
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Cf. A046854, A111314, A131240.
Sequence in context: A050141 A274773 A132752 * A133599 A256399 A336575
Adjacent sequences: A131238 A131239 A131240 * A131242 A131243 A131244
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson, Jun 21 2007
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STATUS
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approved
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