A167852 Triangle read by rows in which each row contains a finite triangle as shown below.

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

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 A326307

Adjacent sequences: A167849 A167850 A167851 * A167853 A167854 A167855

Keyword

easy,nonn,tabf

Author

Omar E. Pol, Nov 13 2009

Status

approved