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A168508 Triangle read by rows, A101688 * A051731 2
1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 3, 1, 1, 1, 1, 3, 2, 1, 1, 1, 1, 4, 2, 1, 1, 1, 1, 1, 1, 4, 2, 1, 1, 1, 1, 1, 1, 5, 2, 2, 1, 1, 1, 1, 1, 1, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row sums = A060831: (1, 2, 4, 5, 7, 9, 11, 12, 15,...).

A168509 = A051731 * A101688

LINKS

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

FORMULA

Triangle read by rows, A101688 * A051731

EXAMPLE

First few rows of the triangle =

1;

1, 1;

2, 1, 1;

2, 1, 1, 1;

3, 1, 1, 1, 1;

3, 2, 1, 1, 1, 1;

4, 2, 1, 1, 1, 1, 1;

4, 2, 1, 1, 1, 1, 1, 1;

5, 2, 2, 1, 1, 1, 1, 1, 1;

5, 3, 2, 1, 1, 1, 1, 1, 1, 1;

6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1;

6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1;

7, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1;

7, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;

8, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;

8, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;

9, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;

...

CROSSREFS

Cf. A101688, A051731, A168509, A060831

Sequence in context: A273619 A034003 A306722 * A177994 A179285 A026835

Adjacent sequences:  A168505 A168506 A168507 * A168509 A168510 A168511

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Nov 27 2009

STATUS

approved

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Last modified March 21 22:19 EDT 2019. Contains 321382 sequences. (Running on oeis4.)