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 A326484 #6 Jul 12 2019 20:21:21
%S A326484 1,-6,28,-72,-176,1824,11968,-177792,-1062656,25864704,155204608,
%T A326484 -5535270912,-33211559936,1633165123584,9798991003648,
%U A326484 -635421070098432,-3812526419542016,315212388818878464,1891274332917465088,-194181169538677604352,-1165087017232048848896
%N A326484 a(n) = 2^n*E2_{n}(-1/2) with E2_{n} the polynomials defined in A326480.
%C A326484 For comments see A326480.
%p A326484 # The function E2(n) is defined in A326480.
%p A326484 seq(subs(x=-1/2, 2^n*E2(n)), n=0..22);
%Y A326484 Cf. A326480, A155585, A326481, A326482, A326483, A326484.
%K A326484 sign
%O A326484 0,2
%A A326484 _Peter Luschny_, Jul 12 2019