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A038766 Triangle giving number of unbranched catapolytetragons, read by rows. 2
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; text; internal format)
OFFSET

0,8

REFERENCES

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

LINKS

Table of n, a(n) for n=0..65.

EXAMPLE

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

CROSSREFS

Last diagonal is A001998.

LCM's of all cycles: A060113.

Sequence in context: A186144 A090544 A283755 * A080993 A140259 A175644

Adjacent sequences:  A038763 A038764 A038765 * A038767 A038768 A038769

KEYWORD

nonn,easy,tabl

AUTHOR

N. J. A. Sloane, May 03 2000

STATUS

approved

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Last modified February 20 12:57 EST 2019. Contains 320327 sequences. (Running on oeis4.)