Number of irreducible positions of size n in Montreal solitaire.

Terms

a(0) =1a(1) =2a(2) =5a(3) =13a(4) =35a(5) =95a(6) =260a(7) =714a(8) =1965a(9) =5415a(10) =14934a(11) =41206a(12) =113730a(13) =313958a(14) =866801a(15) =2393315a(16) =6608473a(17) =18248017a(18) =50389350a(19) =139144906a(20) =384237186a(21) =1061044865a(22) =2930013158a(23) =8091077148a(24) =22343115337a(25) =61699480866a(26) =170380367189a(27) =470497972866