OFFSET
1,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..150
EXAMPLE
a(3) = 4:
.1-2. .1-2. .1-2. .1 2.
.|/ . .| . . / . .|/ .
.3... .3... .3... .3...
MAPLE
a:= n-> `if`(n<3, 1, (n-1)!/2+n^(n-2)):
seq(a(n), n=1..25);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 25 2012
STATUS
approved