Definition:Bernoulli Numbers/Sequence

Definition
The sequence of Bernoulli numbers begins:
 * $1, - \dfrac 1 2, \dfrac 1 6, 0, - \dfrac 1 {30}, 0, \dfrac 1 {42}, 0, - \dfrac 1 {30}, 0, \dfrac 5 {66}, 0, - \dfrac {691} {2730}, \ldots$