OFFSET
0,3
LINKS
Matthew Campbell, Table of n, a(n) for n = 0..10
MAPLE
MATHEMATICA
Table[(n!)^(DivisorSigma[0, n!]/2), {n, 0, 10}]
PROG
(Python)
from math import isqrt, factorial
from sympy import divisor_count
def A280420(n): return (lambda m:isqrt(m)**c if (c:=divisor_count(m)) & 1 else m**(c//2))(factorial(n)) # Chai Wah Wu, Jun 25 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Matthew Campbell, Jan 02 2017
STATUS
approved