  Energy levels of the $1sns$ and $1snp$ states of ions along the helium
isoelectronic sequence from carbon to uranium are calculated, with $n=3$-$7$.
The computation is performed within the relativistic configuration-interaction
method, including the relativistic nuclear recoil effect, the leading QED
effects, and the frequency dependence of the Breit interaction. All theoretical
energies are supplied with uncertainty estimates.
