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A131335 A000012 * A131334. 5
1, 1, 1, 2, 1, 1, 2, 2, 2, 1, 3, 2, 4, 2, 1, 3, 3, 6, 4, 3, 1, 4, 3, 9, 6, 7, 3, 1, 4, 4, 12, 9, 13, 7, 4, 1, 5, 4, 16, 12, 22, 13, 11, 4, 1, 5, 5, 20, 16, 34, 22, 24, 11, 5, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row sums = A000071, Fibonacci numbers - 1, starting (1, 2, 4, 7, 12, 20, 33,...).

LINKS

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

FORMULA

A000012 * A131334 as infinite lower triangular matrices, where A000012 = (1; 1,1; 1,1,1;...).

EXAMPLE

First few rows of the triangle are:

1;

1, 1;

2, 1, 1;

2, 2, 2, 1;

3, 2, 4, 2, 1;

3, 3, 6, 4, 3, 1;

4, 3, 9, 6, 7, 3, 1;

...

CROSSREFS

Cf. A000071, A131334, A000012, A131332, A131333.

Sequence in context: A240473 A286569 A342749 * A225332 A209032 A183935

Adjacent sequences:  A131332 A131333 A131334 * A131336 A131337 A131338

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jun 29 2007

STATUS

approved

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Last modified July 25 18:32 EDT 2021. Contains 346291 sequences. (Running on oeis4.)