In their paper, Explicit Inverse of the Pascal Matrix Plus One, S.L.
Yang and Z.K. Liu showed that the inverse of Ln +In is the Hadamard
product between Ln and a lower triangular matrix. We are going to
describe this unique lower triangular matrix next. For this we need to
define the Euler polynomials.
Euler polynomials, En(x), can be defined by the following generating
function: