A038766 Triangle giving number of unbranched catapolytetragons, read by rows.

1, 1, 1, 1, 1, 1, 1, 3, 3, 2, 1, 3, 9, 7, 4, 1, 5, 16, 29, 23, 10, 1, 5, 27, 62, 99, 69, 25, 1, 7, 39, 132, 275, 351, 229, 70, 1, 7, 55, 221, 643, 1121, 1249, 731, 196, 1, 9, 72, 367, 1278, 2997, 4584, 4437, 2385, 574, 1, 9, 93, 540, 2322, 6678, 13458, 18012, 15597, 7657, 1681

Offset: 0

Author

N. J. A. Sloane, May 03 2000

Keywords

• nonn
• easy
• tabl

Examples

			1; 1,1; 1,1,1; 1,3,3,2; 1,3,9,7,4; ...
		

References

• S. J. Cyvin et al., Unbranched catacondensed polygonal systems containing hexagons and tetragons, Croatica Chem. Acta, 69 (1996), 757-774.

Crossrefs

Last diagonal is A001998.

LCM's of all cycles: A060113.