A085633 Number of not necessarily connected coin graphs, also known as "penny" graphs.

1, 2, 4, 10, 25, 80, 267, 1078

Offset

1,2

Comments

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

Links

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

Crossrefs

Cf. A085632.

Sequence in context: A006901 A123422 A123413 * A111564 A350507 A007021

Adjacent sequences: A085630 A085631 A085632 * A085634 A085635 A085636

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