OFFSET
0,3
FORMULA
a(n) = A243424(n,floor(n^2/4)).
EXAMPLE
a(2) = 6:
+---+ +---+ +---+ +---+ +---+ +---+
|o-o| | | |o | | o| |o | | o|
| | | | || | | || | \ | | / |
| | |o-o| |o | | o| | o| |o |
+---+ +---+ +---+ +---+ +---+ +---+.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jun 05 2014
STATUS
approved