A145809 - OEIS

A145809

Number of islands of ones fitting in an n X n array with all ones connected only either three adjacent vertically or three adjacent horizontally.

0, 0, 2, 2, 4, 6, 8, 10, 14, 15, 20, 24

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

OFFSET

1,3

LINKS

EXAMPLE

8 X 8 example with 10 islands

.0.1.1.1.0.1.1.1

.1.0.0.0.0.0.0.0

.1.0.0.0.0.1.1.1

.1.0.1.1.1.0.0.0

.0.0.0.0.0.1.1.1

.1.0.1.1.1.0.0.0

.1.0.0.0.0.1.1.1

.1.0.1.1.1.0.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 20 2008

STATUS

approved