A352601 - OEIS

%I #15 Aug 02 2024 05:59:00

%S 1,2,20,336,7920,240240,8910720,390700800,19769460480,1133836704000,

%T 72684900288000,5150244363264000,399703747322880000,

%U 33719008124158156800,3072176295756632064000,300649528529562820608000,31451820032947491201024000,3502589049123697883750400000

%N a(n) = RisingFactorial(2*n, n) = A124320(2*n, n).

%F a(n) ~ 3^(3*n - 1/2) * n^n / (2^(2*n - 1/2) * exp(n)). - _Vaclav Kotesovec_, Aug 02 2024

%t Table[Pochhammer[2*n, n], {n, 0, 17}] (* _Amiram Eldar_, Mar 22 2022 *)

%o (Sage)

%o def a(n): return rising_factorial(2*n, n)

%o print([a(n) for n in range(18)])

%o (Python)

%o from sympy import rf

%o def A352601(n): return rf(2*n,n) # _Chai Wah Wu_, Mar 22 2022

%Y Cf. A124320.

%K nonn

%O 0,2

%A _Peter Luschny_, Mar 22 2022