-56623104domain: ZAppears in sequencesa(n) = -2*a(n-1) + 4*a(n-3), with a(0) = 1, a(1) = -2, a(2) = 4.at n=28A099211Expansion of (1-8x^2-24x^3)/((1-2x)^2*(1+2x+4x^2)).at n=21A168054Triangle read by rows: coefficients T(n,k) of a binomial decomposition of 2^n-1 as Sum(k=0..n)T(n,k)*binomial(n,k).at n=62A244126