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A247646 Irregular triangle read by rows, arising in enumeration of lattice paths in strips. 1
1, 1, 3, 3, 1, 1, 3, 9, 5, 7, 11, 1, 3, 9, 15, 12, 10, 9, 3, 1, 1, 1, 3, 9, 15, 27, 16, 20, 12, 14, 3, 3, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

It would be nice to have a more explicit definition.

LINKS

Table of n, a(n) for n=0..33.

Johann Cigler, Some remarks and conjectures related to lattice paths in strips along the x-axis, arXiv:1501.04750.

EXAMPLE

Triangle begins:

1,

1,3,3,1,

1,3,9,5,7,11,

1,3,9,15,12,10,9,3,1,1,

1,3,9,15,27,16,20,12,14,3,3,1,1,

...

CROSSREFS

The diagonals on the left are given by A247643.

Sequence in context: A160324 A197928 A109439 * A133333 A296523 A171876

Adjacent sequences:  A247643 A247644 A247645 * A247647 A247648 A247649

KEYWORD

nonn,tabf,more

AUTHOR

N. J. A. Sloane, Sep 23 2014

STATUS

approved

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Last modified September 20 06:51 EDT 2020. Contains 337264 sequences. (Running on oeis4.)