Let , , and
(1)
|
where
(2)
| |||
(3)
|
Then if either and , or and ,
(4)
|
where is a Bernoulli polynomial, and the second term on the right side can be written explicitly as
(5)
|
Let , , and
(1)
|
where
(2)
| |||
(3)
|
Then if either and , or and ,
(4)
|
where is a Bernoulli polynomial, and the second term on the right side can be written explicitly as
(5)
|
Weisstein, Eric W. "Iseki's Formula." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/IsekisFormula.html