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 A066120 #22 Dec 31 2024 14:05:10
%S A066120 1,2,24,8640,653184000,114069441024000000,
%T A066120 598216546007097937920000000000,
%U A066120 1601591599167888308924824752807936000000000000000
%N A066120 Superduperprimorials: product of first n terms in Chernoff sequence.
%C A066120 First number with n distinct positive triangular exponents in its prime factorization. Subsequence of A025487. - _Matthew Vandermast_, Nov 05 2009; edited May 23 2012
%H A066120 Harry J. Smith, <a href="/A066120/b066120.txt">Table of n, a(n) for n = 0..17</a>
%F A066120 a(n) = Product_{i=1..n} prime(i)^((n-i+1)*(n-i+2)/2) = a(n-1)*A006939(n) = A066119(n-3, 4).
%e A066120 a(4) = 2*(2*(2*3))*(2*(2*3)*(2*3*5)) = 2*(2*6)*(2*6*30) = 2*12*360 = 8640.
%o A066120 (PARI) a(n) = { my(p=primes(n)); prod(i=1, #p, p[i]^((n - i + 1)*(n - i + 2)/2)) } \\ _Harry J. Smith_, Feb 01 2010
%Y A066120 Cf. A000040, A002110, A006939, A055462, A166475.
%K A066120 nonn,easy
%O A066120 0,2
%A A066120 _Henry Bottomley_, Dec 05 2001