  We review all symmetry-allowed spin-singlet and spin-triplet superconducting
(SC) order parameters in graphene ($s$-wave, $d$-wave, $p$-wave, and $f$-wave)
generated by generic onsite, nearest-neighbor (NN), and
next-to-nearest-neighbor (NNN) pairing interactions in a tight-binding model.
For each pairing channel, we calculate both the band structure and the
dependence of the density of states on energy, chemical potential, and on the
pairing strength. In particular, we distinguish between nodal superconducting
states and fully gapped states and study the dependence of gap closing points
on the chemical potential and the superconducting pairing strength. We further
investigate the difference between mono-, bi-, and tri-layer ABC and ABA
graphene, including accounting for the effects of trigonal warping.
