OFFSET
1,2
LINKS
John Mason, Table of n, a(n) for n = 1..50
Andrew Clarke, Isoperimetrical Polyominoes [Link updated by William Rex Marshall, Dec 16 2009]
FORMULA
a(n) = n*A000105(n).
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 04 2000
EXTENSIONS
More terms from David Wasserman, Oct 26 2003
STATUS
approved