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A236628 Triangle read by rows in which T(n,k) is the number of parts in the k-th region of the set of overcompositions of n, with overcompositions in colexicographic order. 2
2, 2, 4, 2, 6, 4, 12, 2, 6, 4, 14, 4, 6, 4, 26 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Right border gives A236002, n >= 1.

Row sums give A236625, n >= 1.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Written as an irregular triangle in which row n has length 2^n the sequence begins:

2;

2, 4;

2, 6, 4, 12;

2, 6, 4, 14, 4, 6, 4, 26;

...

For n = 3 the diagram shows the four regions of the overcompositions of 3, with overcompositions in colexicographic order.

------------------------------------------------

.  Diagram of            Regions of the diagram

overcompositions        ------------------------

.    of 3                k: 1     2   3       4

------------------------------------------------

.    _ _ _                  _     _           _

1   |.| | |                |.|   | |         | |

2   |_| | |                |_|  _| |         | |

3   |  .|.|                    |  .|         |.|

4   |   |.|                    |   |         |.|

5   |  .| |                    |  .|         | |

6   |_ _| |                    |_ _|  _     _| |

7   |.|  .|                          |.|   |  .|

8   | |  .|                          | |   |  .|

9   |.|   |                          |.|   |   |

10  |_|   |                          |_|  _|   |

11  |    .|                              |    .|

12  |_ _ _|                              |_ _ _|

...

Number of parts.........:   2     6   4      12

.

Every row of every region contains only one part.

CROSSREFS

Cf. A236002, A236625, A236626.

Sequence in context: A240828 A239240 A054929 * A078429 A171751 A124676

Adjacent sequences:  A236625 A236626 A236627 * A236629 A236630 A236631

KEYWORD

nonn,tabf,more

AUTHOR

Omar E. Pol, Feb 01 2014

STATUS

approved

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Last modified July 18 01:14 EDT 2019. Contains 325110 sequences. (Running on oeis4.)