OFFSET
1,1
FORMULA
A370827(n)/a(n) = (2/3) * (3/5)^n * ((5/2)^n - 1) / (1 - (3/5)^n).
EXAMPLE
A370827(n)/a(n) for n = 1..8: 3/2, 63/32, 1053/392, 16443/4352, 250533/46112, 28431/3584, 56859813/4860032, 853737003/49160192.
PROG
(PARI) a370828(n) = denominator((2/3) * (3/5)^n * ((5/2)^n - 1) / (1 - (3/5)^n))
(Python)
from math import gcd
def A370828(n): return (a:=5**n-3**n<<n-1)//gcd(a, 3**(n-1)*(5**n-(1<<n))) # Chai Wah Wu, Mar 12 2024
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
Hugo Pfoertner, Mar 09 2024
STATUS
approved