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Corese is a Semantic Web Factory (triple store and SPARQL endpoint) implementing RDF, RDFS, SPARQL 1.1 Query and Update, Shacl. STTL. LDScript.

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prefix ex: 
select                                 
 (ex:sigma(?n) as ?e) ?n
  
where {

    bind (unnest(xt:iota(12)) as ?n)

}
order by desc(?n)

function xt:fac(?n) { 
  if (?n = 0, 1, ?n *  xt:fac(?n - 1))
}

function ex:fun(?n) {
 1 / xt:fac(?n)
}

function ex:sigma(?n) {
   reduce (rq:plus, maplist (ex:fun, xt:iota(0, ?n)))
}