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A164002 Triangle read by rows in which each row contains a finite triangle as shown below. 4
1, 1, 1, 1, 1, 2, 2, 1, 2, 1, 1, 2, 2, 2, 3, 2, 1, 2, 2, 1, 1, 2, 2, 2, 3, 2, 2, 3, 3, 2, 1, 2, 2, 2, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 3, 2, 3, 4, 3, 2, 1, 2, 3, 3, 2, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 3, 3, 4, 5, 4, 3, 2, 3, 4, 4, 3, 2, 1, 2, 3, 3, 3, 2, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 3, 3, 4, 5, 4, 3, 3, 4, 5, 5, 4, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

COMMENTS

See also A159800.

LINKS

Table of n, a(n) for n=1..105.

EXAMPLE

The main triangle begins:

1

1,1,1

1,2,2,1,2,1

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

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

1,2,2,3,3,3,3,4,4,3,2,3,4,3,2,1,2,3,3,2,1

1,2,2,3,3,3,3,4,4,3,3,4,5,4,3,2,3,4,4,3,2,1,2,3,3,3,2,1

1,2,2,3,3,3,3,4,4,3,3,4,5,4,3,3,4,5,5,4,3,2,3,4,4,4,3,2,1,2,3,3,3,3,2,1

In which row 1 contains a vertex, only:

1

Row 2 contains the triangle:

1

1,1

Row 3 contains the triangle:

1

2,2

1,2,1

Row 4 contains the triangle:

1

2,2

2,3,2

1,2,2,1

Row 5 contains the triangle:

1

2,2

2,3,2

2,3,3,2

1,2,2,2,1

Row 6 contains the triangle:

1

2,2

3,3,3

3,4,4,3

2,3,4,3,2

1,2,3,3,2,1

Row 7 contains the triangle:

1

2,2

3,3,3

3,4,4,3

3,4,5,4,3

2,3,4,4,3,2

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

Row 8 contains the triangle:

1

2,2

3,3,3

3,4,4,3

3,4,5,4,3

3,4,5,5,4,3

2,3,4,4,4,3,2

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

Row 9 contains the triangle:

1

2,2

3,3,3

4,4,4,4

4,5,5,5,4

4,5,6,6,5,4

3,4,5,6,5,4,3

2,3,4,5,5,4,3,2

1,2,3,4,4,4,3,2,1

Row 10 contains the triangle:

1

2,2

3,3,3

4,4,4,4

4,5,5,5,4

4,5,6,6,5,4

4,5,6,7,6,5,4

3,4,5,6,6,5,4,3

2,3,4,5,5,5,4,3,2

1,2,3,4,4,4,4,3,2,1

And so on...

CROSSREFS

Cf. A159800, A163993, A163994.

Sequence in context: A001285 A088424 A097456 * A182596 A087775 A089955

Adjacent sequences:  A163999 A164000 A164001 * A164003 A164004 A164005

KEYWORD

nonn,tabf

AUTHOR

Omar E. Pol, Nov 10 2009

STATUS

approved

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Last modified June 17 23:56 EDT 2013. Contains 226327 sequences.