2015 New York Laws
NPC - Not-For-Profit Corporation
Article 7 - (Not-For-Profit Corporation) DIRECTORS AND OFFICERS
707 - Quorum of directors.

707. Quorum of directors.
Unless  a  greater  proportion  is  required by this chapter or by the
  certificate of incorporation or by a by-law adopted by  the  members,  a
  majority  of  the  entire  board  shall  constitute  a  quorum  for  the
  transaction of business or of any specified  item  of  business,  except
  that  the certificate of incorporation or the by-laws may fix the quorum
  at less than a majority of the entire board, provided that in  the  case
  of  a  board  of  fifteen  members  or less the quorum shall be at least
  one-third of the entire number of members and in the case of a board  of
  more than fifteen members the quorum shall be at least five members plus
  one  additional  member  for  every ten members (or fraction thereof) in
  excess of fifteen.