OFFSET
0,2
FORMULA
a(n) = A348129(2n,n).
EXAMPLE
a(1) = 4:
+-----+ +-----+ +-----+ +-----+
| Q . | | . . | | . Q | | . . |
| . . | | Q . | | . . | | . Q |
+-----+ +-----+ +-----+ +-----+ .
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Alois P. Heinz, Oct 01 2021
EXTENSIONS
a(9)-a(10) from Martin Ehrenstein, Oct 06 2021
STATUS
approved