-137438953472domain: ZAppears in sequencesExpansion of e.g.f.: 1/2 + exp(-4*x)/2.at n=19A009117Expansion of (1-2*x)/(1-8*x^2).at n=25A094014Determinant of n X n partial Hadamard matrix with coefficient m(i,j) 1<=i,j<=n (see comment).at n=18A094384Alternating row sums of A346837.at n=38A347596