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 A309802 #55 Aug 19 2019 23:11:08
%S A309802 1,10,101,1358,20581,390238,8130689,201123530,6166988769,201097530280,
%T A309802 7754625545261,329758834067168,14671637258193181,711027519310719868,
%U A309802 38706187989054920001,2338431642812927422310,145908145906128304198449,9976861293427674211625032
%N A309802 a(n) is the coefficient of x^n in the polynomial Product_{i=1..n+2} (prime(i)*x-1).
%H A309802 Alexey V. Bazhin, <a href="/A309802/b309802.txt">Table of n, a(n) for n = 0..300</a>
%F A309802 a(n) = [x^n] Product_{i=1..n+2} (prime(i)*x-1).
%F A309802 a(n) = abs(A070918(n+2,2)).
%F A309802 a(n) = abs(A238146(n+2,n)) for n>0.
%F A309802 a(n) = A260613(n+2,n).
%p A309802 a:= n-> coeff(mul(ithprime(i)*x-1, i=1..n+2), x, n):
%p A309802 seq(a(n), n=0..20); # _Alois P. Heinz_, Aug 18 2019
%Y A309802 Cf. A000040, A002110, A024451, A070918, A309803, A309804, A033999, A007504, A024447, A024448, A024449, A054640, A005867, A238146, A260613.
%K A309802 nonn,easy
%O A309802 0,2
%A A309802 _Alexey V. Bazhin_, Aug 17 2019