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A057409 Number of self-avoiding polygons of area n with any number of (self-avoiding polygon) holes on square lattice (not allowing rotations). 1
1, 2, 6, 19, 63, 216, 756, 2685, 9650, 35018, 128084, 471623, 1746492, 6499356, 24290272, 91123171, 342984175, 1294829776, 4901319978, 18597856445, 70723784744, 269486503694, 1028736811230, 3933715966653 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

I. Jensen, Table of n, a(n) for n = 1..40 (from link below)

I. Jensen, More terms

CROSSREFS

Sequence in context: A059713 A109262 A006724 * A141771 A001170 A001168

Adjacent sequences:  A057406 A057407 A057408 * A057410 A057411 A057412

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 30 2000

STATUS

approved

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Last modified February 22 17:35 EST 2019. Contains 320400 sequences. (Running on oeis4.)