A085632 - OEIS

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A085632

Number of connected coin graphs, also known as "penny" graphs.

3

1, 1, 2, 5, 13, 46, 162, 715

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

The intersection graph of unit disks which are not allowed to overlap.

LINKS

Table of n, a(n) for n=1..8.

Erich Friedman, Illustration for A085632

CROSSREFS

Sequence in context: A000719 A149875 A221546 * A378584 A111563 A079573

Adjacent sequences: A085629 A085630 A085631 * A085633 A085634 A085635

KEYWORD

more,nonn

AUTHOR

Leah Hackman (lhackman(AT)cs.ualberta.ca), Martha Lednicky (lednicky(AT)cs.ualberta.ca), Jim Nastos and Rick L. Shepherd, Jul 10 2003

STATUS

approved