A247646 Irregular triangle read by rows, arising in enumeration of lattice paths in strips.

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

Offset: 0

Author

N. J. A. Sloane, Sep 23 2014

Keywords

• nonn
• tabf
• more

Comments

It would be nice to have a more explicit definition.

Examples

			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,
...
		

Links

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

Crossrefs

The diagonals on the left are given by A247643.