OFFSET
0,2
LINKS
Ed Wynn, Table of n, a(n) for n = 0..9
FORMULA
a(n) = A333580(2*(2*n+1), 2*n+1).
PROG
(Python)
# Using graphillion
from graphillion import GraphSet
import graphillion.tutorial as tl
def A333863(n):
universe = tl.grid(4 * n + 1, 2 * n)
GraphSet.set_universe(universe)
start, goal = 1, 2 * (2 * n + 1) ** 2
paths = GraphSet.paths(start, goal, is_hamilton=True)
return paths.len()
print([A333863(n) for n in range(7)])
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Apr 08 2020
EXTENSIONS
More terms from Ed Wynn, Jun 28 2023
STATUS
approved