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 A080498 #8 Aug 13 2024 19:33:04
%S A080498 1,1,1,1,1,2,3,8,15,48,210,1152,3780,19200,62370,322560,2162160,
%T A080498 17418240,81081000,567705600,2481078600,16907304960,146659312800,
%U A080498 1504935936000,8799558768000,76435881984000,819678899239200
%N A080498 a(n) = (n-c_1)(n-c_2)...(n-c_k) where c_k is the k-th composite number and is also the largest composite number < n.
%H A080498 Harvey P. Dale, <a href="/A080498/b080498.txt">Table of n, a(n) for n = 1..539</a>
%e A080498 a(6) = (6-4) = 2. a(10) = (10-4)(10-6)(10-8)(10-9) = 48.
%t A080498 Module[{nn=30,cmps},cmps=Select[Range[nn],CompositeQ];Table[Times@@(n-Select[ cmps,#<n&]),{n,nn}]] (* _Harvey P. Dale_, Aug 13 2024 *)
%Y A080498 Cf. A080497, A072513, A080500.
%K A080498 nonn
%O A080498 1,6
%A A080498 _Amarnath Murthy_, Mar 19 2003
%E A080498 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003