How many {series} are to/by {The Flintstones} ?
What's the number of Flintstones television shows?
How many series are there of The Flinstones?
SELECT ( COUNT ( ?o ) AS ?e ) { ?o property:part_of_the_series resource:The_Flintstones }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P179> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q201358 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P179 wd:Q201358 }
180