In the paper "High Precision Theory of Atomic Helium", Drake lists the then best-known ground state energy of the Schrödinger equation for helium to 22 digits as: $$\lambda_0 \approx -2.90372437703411959382$$ in atomic units.
Korobov gives the ground state to 24 digits as: $$\lambda_0 \approx -2.903724377034119598311159.$$
In 2007, we get ~45 digits with Nakashima and Nakasuji's calculation of: $$\lambda_0 = −2.90372437703411959831115924519440444669690537.$$
I am looking for the highest precision calculation of the helium ground state, but with Nakashima and Nakasuji's paper, the trail goes cold. The closest citing article is again from Korobov, which suggests perhaps not all of Nakasuji's digits are correct.
What is the most accurate computation of the helium ground state?
I am also interested in the first excited state.
Korobov lists the first excited state at $\lambda_1 \approx -2.145974046054417415805028975461921$, but is this the best calculation?