I confirm the bug with Sage 10.3.beta7. It seems to be linked with the 
Maxima interface. 
Meanwhile, a workaround is to use the SymPy interface: 

sage: sum((4*n+1)/factorial(n), n, 1, oo, algorithm='sympy')
5*e - 1

Eric. 
Le vendredi 9 février 2024 à 11:57:08 UTC+1, Georgi Guninski a écrit :

> hi,
>
> var('n')
> sum((4*n+1)/factorial(n),n,1,oo)
>
> TypeError: 'NoneType' object is not callable
>

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