No. 9-John Hanson-is often declared the First President, he was the first elected after the British surrendered at Yorktown. Samuel Johnston of North Carolina was elected after the ratification of the Articles of Confederation in 1781, he declined, Thomas McKean was elected instead.
While the post was largely ceremonial the office holder did have to handle the correspondence and sign documents. The position was for one year with no right of succession, they were big believers in rotation in office then.
Yes, the Articles of Confederation period is rather interesting and deserves closer scrutiny.
My long gone paternal grandmother told me she was related to Van Buren, may investigate that "someday".