JEFFREY C. LAGARIASJeffery Lagarias, in his recent article EULER’S CONSTANT:EULER’S WORK AND MODERN DEVELOPMENTS for Bulletin of Euler's constant: Euler's work and modern developments in the AMS Bulletin, mentions that Euler obtained $\zeta(3)={{2\pi^3 b(3/2)}\over 3}$ for some 'bernoulli function'"Bernoulli function" $b(z)$ in '2Section 2.4 zeta values'("Zeta values") of his article.
JEFFREY C. LAGARIASLagarias also mentions that Euler similarly obtained a value for $\zeta(5)$ in terms of $b(5/2)$.
Is there any modern article explaining this 'bernoulli function'"Bernoulli function $b(z)$?