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 A255484 #11 Dec 13 2023 08:51:26 %S A255484 2,6,0,210,0,0,0,9699690,0,0,0,0,0,0,0,32589158477190044730,0,0,0,0,0, %T A255484 0,0,0,0,0,0,0,0,0,0, %U A255484 525896479052627740771371797072411912900610967452630,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A255484 a(n) = Product_{k=0..n} prime(k+1)*(binomial(n,k) mod 2). %C A255484 A123098 is a much better version of this sequence. %H A255484 Chai Wah Wu, <a href="/A255484/b255484.txt">Table of n, a(n) for n = 0..510</a> %p A255484 f:=n->mul(ithprime(k+1)*(binomial(n,k) mod 2),k=0..n); %p A255484 [seq(f(n),n=0..60)]; %o A255484 (Python) %o A255484 from operator import mul %o A255484 from functools import reduce %o A255484 from sympy import prime %o A255484 def A255484(n): %o A255484 return reduce(mul,(0 if ~n & k else prime(k+1) for k in range(n+1))) # _Chai Wah Wu_, Feb 09 2016 %Y A255484 Cf. A123098, A255483. %K A255484 nonn %O A255484 0,1 %A A255484 _N. J. A. Sloane_, Feb 28 2015