-1310720domain: ZAppears in sequencesa(n) = 2*a(n-1) - 2*a(n-2), with a(0)=1, a(1)=5.at n=37A136258Inverse binomial transform of A166517.at n=20A166577a(n) = 2^n*floor((5-2*n)/3).at n=17A171552Determinant of the matrix a(i,j) = 1 if abs(i-j) < 2 and -1 in the rest.at n=16A174647