



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
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OFFSET

1,2


COMMENTS

Row sums = A131780: (1, 4, 5, 10, 15, 26, 41,...), a sequence with a(n)/a(n1) tending to phi. A131779 is a companion triangle, same row sums.


LINKS

Table of n, a(n) for n=1..55.


FORMULA

2*A046854  A000012(signed by columns +  + ,...).


EXAMPLE

First few rows of the triangle are:
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

Cf. A131779, A131780, A046854, A000012.
Sequence in context: A131775 A218825 A035691 * A082465 A226856 A131327
Adjacent sequences: A131778 A131779 A131780 * A131782 A131783 A131784


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, Jul 14 2007


STATUS

approved



