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a(n) = E2_{n}(0) with E2_{n} the polynomials defined in A326480.
5

%I #8 Jul 12 2019 20:20:59

%S 1,-2,2,4,-16,-32,272,544,-7936,-15872,353792,707584,-22368256,

%T -44736512,1903757312,3807514624,-209865342976,-419730685952,

%U 29088885112832,58177770225664,-4951498053124096,-9902996106248192,1015423886506852352

%N a(n) = E2_{n}(0) with E2_{n} the polynomials defined in A326480.

%C For comments see A326480.

%p # The function E2(n) is defined in A326480.

%p seq(subs(x=0, E2(n)), n=0..22);

%Y Bisections (up to signs): A000182, A012509.

%Y Cf. A326480, A155585, A326481, A326482, A326483, A326484.

%Y Cf. A063376, A241209.

%K sign

%O 0,2

%A _Peter Luschny_, Jul 12 2019