OFFSET
0,3
COMMENTS
A "hump" is a local maxima of the upper envelope of the part of the meander that extends above the East-West road.
EXAMPLE
The three open meanders with 4 crossings have respectively 2, 1 and 1 humps, so a(2) = 4.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane and Jon Wild, Nov 29 2002
EXTENSIONS
a(9)-a(20) from Andrew Howroyd, Nov 22 2015
STATUS
approved