

A159905


Triangle read by rows, Mobius transform of A004736


2



1, 1, 1, 2, 2, 1, 2, 2, 2, 1, 4, 4, 3, 2, 1, 2, 2, 3, 3, 2, 1, 6, 6, 5, 4, 3, 2, 1, 4, 4, 4, 4, 4, 3, 2, 1, 6, 6, 6, 6, 5, 4, 3, 2, 1, 4, 4, 5, 5, 5, 5, 4, 3, 2, 1, 10, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 4, 4, 4, 5, 6, 6, 6, 5, 4, 3, 2, 1
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OFFSET

1,4


COMMENTS

Row sums = A007438, Mobius transform of the triangular numbers.
Left border = phi(n), A000010.


LINKS

Table of n, a(n) for n=1..78.


FORMULA

Triangle read by rows, A054525 * A004736. A054525 = the Mobius transform, A004736 = the natural number "decrescendo" triangle: (1; 2,1; 3,2,1;...)


EXAMPLE

First few rows of the triangle =
1;
1, 1;
2, 2, 1;
2, 2, 2, 1;
4, 4, 3, 2, 1;
2, 2, 3, 3, 2, 1;
6, 6, 5, 4, 3, 2, 1;
4, 4, 4, 4, 4, 3, 2, 1;
6, 6, 6, 6, 5, 4, 3, 2, 1;
4, 4, 5, 5, 5, 5, 4, 3, 2, 1;
...


CROSSREFS

Cf. A007438
Sequence in context: A168258 A116204 A291592 * A283735 A274534 A224030
Adjacent sequences: A159902 A159903 A159904 * A159906 A159907 A159908


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, Apr 25 2009


STATUS

approved



