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A167852 Triangle read by rows in which each row contains a finite triangle as shown below. 2
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 2, 3, 2, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 2, 3, 2, 1, 1, 2, 3, 3, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,15

COMMENTS

See also A159800, A164002, A167850 and A167851.

LINKS

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

EXAMPLE

The main triangle begins:

1,

1,1,1,

1,1,1,1,1,1,

1,1,1,1,2,1,1,1,1,1,

1,1,1,1,2,1,1,2,2,1,1,1,1,1,1,

1,1,1,1,2,1,1,2,2,1,1,2,2,2,1,1,1,1,1,1,1,

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

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

In which row 1 contains a vertex, only:

1,

Row 2 contains the triangle:

1,

1,1,

Row 3 contains the triangle:

1,

1,1,

1,1,1,

Row 4 contains the triangle:

1,

1,1,

1,2,1,

1,1,1,1,

Row 5 contains the triangle:

1,

1,1,

1,2,1,

1,2,2,1,

1,1,1,1,1,

Row 6 contains the triangle:

1,

1,1,

1,2,1,

1,2,2,1,

1,2,2,2,1,

1,1,1,1,1,1,

Row 7 contains the triangle:

1,

1,1,

1,2,1,

1,2,2,1,

1,2,3,2,1,

1,2,2,2,2,1,

1,1,1,1,1,1,1,

Row 8 contains the triangle:

1,

1,1,

1,2,1,

1,2,2,1,

1,2,3,2,1,

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

1,2,2,2,2,2,1,

1,1,1,1,1,1,1,1,

Row 9 contains the triangle:

1,

1,1,

1,2,1,

1,2,2,1,

1,2,3,2,1,

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

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

1,2,2,2,2,2,2,1,

1,1,1,1,1,1,1,1,1,

Row 10 contains the triangle:

1,

1,1,

1,2,1,

1,2,2,1,

1,2,3,2,1,

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

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

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

1,2,2,2,2,2,2,2,1,

1,1,1,1,1,1,1,1,1,1,

And so on...

CROSSREFS

Cf. A159800, A164002, A167850, A167851.

Sequence in context: A127937 A250209 A280010 * A184340 A083911 A095827

Adjacent sequences:  A167849 A167850 A167851 * A167853 A167854 A167855

KEYWORD

easy,nonn,tabf

AUTHOR

Omar E. Pol, Nov 13 2009

STATUS

approved

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Last modified November 15 11:35 EST 2018. Contains 317238 sequences. (Running on oeis4.)