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A038766
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Triangle giving number of unbranched catapolytetragons, read by rows.
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2
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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
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,8
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REFERENCES
| S. J. Cyvin et al., Unbranched catacondensed polygonal systems containing hexagons and tetragons, Croatica Chem. Acta, 69 (1996), 757-774.
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EXAMPLE
| 1; 1,1; 1,1,1; 1,3,3,2; 1,3,9,7,4; ...
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CROSSREFS
| Last diagonal is A001998.
LCM's of all cycles: A060113.
Sequence in context: A075522 A186144 A090544 * A080993 A140259 A175644
Adjacent sequences: A038763 A038764 A038765 * A038767 A038768 A038769
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KEYWORD
| nonn,easy,tabl
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 03 2000
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