OFFSET
1,2
LINKS
Ed Wynn, Table of n, a(n) for n = 1..87
Eric Weisstein's World of Mathematics, Graph Cycle
PROG
(Python)
# Using graphillion
from graphillion import GraphSet
def make_CnXPk(n, k):
grids = []
for i in range(1, k + 1):
for j in range(1, n):
grids.append((i + (j - 1) * k, i + j * k))
grids.append((i + (n - 1) * k, i))
for i in range(1, k * n, k):
for j in range(1, k):
grids.append((i + j - 1, i + j))
return grids
def A339142(n):
universe = make_CnXPk(5, n)
GraphSet.set_universe(universe)
cycles = GraphSet.cycles()
return cycles.len()
print([A339142(n) for n in range(1, 9)])
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Nov 25 2020
EXTENSIONS
More terms from Ed Wynn, Jun 28 2023
STATUS
approved