This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A347304 #25 Aug 19 2024 11:42:49 %S A347304 1,1,2,6,12,60,60,420,840,2520,5040,55440,13860,180180,360360,1081080, %T A347304 2162160,36756720,4084080,77597520,155195040,465585120,931170240, %U A347304 21416915520,1338557220,33463930500,66927861000,200783583000,401567166000,11645447814000,465817912560 %N A347304 a(n) = n!/(floor(n/2)!*floor(n/3)!*floor(n/6)!). %H A347304 Seiichi Manyama, <a href="/A347304/b347304.txt">Table of n, a(n) for n = 0..2000</a> %H A347304 Denis Hanson, <a href="https://doi.org/10.4153/CMB-1972-007-7">On the product of the primes</a>, Canadian Mathematical Bulletin 15.1 (1972): 33-37. See Section 3. %o A347304 (PARI) a(n) = n!/((n\2)!*(n\3)!*(n\6)!); \\ _Seiichi Manyama_, Aug 28 2021 %o A347304 (Python) %o A347304 from math import factorial %o A347304 def A347304(n): return factorial(n)//factorial(n//2)//factorial(n//3)//factorial(n//6) # _Chai Wah Wu_, Aug 28 2021 %Y A347304 a(6*n) = A113424(n). %Y A347304 Cf. A081125, A347302. %K A347304 nonn %O A347304 0,3 %A A347304 _N. J. A. Sloane_, Aug 28 2021 %E A347304 a(0)=1 prepended by _Seiichi Manyama_, Aug 28 2021