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A131781 2*A046854 - A000012 (signed by columns + - + -, ...). 0
1, 3, 1, 1, 3, 1, 3, 3, 3, 1, 1, 5, 5, 3, 1, 3, 5, 7, 7, 3, 1, 1, 7, 11, 9, 9, 3, 1, 3, 7, 13, 19, 11, 11, 3, 1, 1, 9, 19, 21, 29, 13, 13, 3, 1, 3, 9, 21, 39, 31, 41, 15, 15, 3, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row sums = A131780: (1, 4, 5, 10, 15, 26, 41, ...), a sequence with a(n)/a(n-1) tending to phi.
A131779 is a companion triangle, same row sums.
LINKS
EXAMPLE
First few rows of the triangle:
1;
3, 1;
1, 3, 1;
3, 3, 3, 1;
1, 5, 5, 3, 1;
3, 5, 7, 7, 3, 1;
1, 7, 11, 9, 9, 3, 1;
3, 7, 13, 19, 11, 11, 3, 1;
...
CROSSREFS
Sequence in context: A131775 A218825 A035691 * A082465 A226856 A131327
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jul 14 2007
STATUS
approved

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Last modified February 21 11:22 EST 2024. Contains 370233 sequences. (Running on oeis4.)