1,3

At one time it was thought that this might be related to the Hopf algebra structure of perturbative Quantum Field Theory; this later proved not to be the case.

Possibly erroneous version of A093637. - Sean A. Irvine, Dec 09 2019

Table of n, a(n) for n=1..20.

Dirk Kreimer, "On the Hopf algebra structure of perturbative quantum field theory"

Dirk Kreimer, Home page

Sequence in context: A128496 A134955 A171887 * A002861 A032200 A130969

Adjacent sequences: A027878 A027879 A027880 * A027882 A027883 A027884

nonn

Dirk Kreimer (kreimer(AT)dipmza.physik.Uni-Mainz.DE)

approved