Number of irreducible positions of size n in Montreal solitaire.

Terms

a(0) =1a(1) =2a(2) =7a(3) =17a(4) =49a(5) =134a(6) =368a(7) =1017a(8) =2806a(9) =7743a(10) =21374a(11) =59015a(12) =162942a(13) =449916a(14) =1242352a(15) =3430578a(16) =9473170a(17) =26159353a(18) =72237232a(19) =199478805a(20) =550850090a(21) =1521145442a(22) =4200572421a(23) =11599692758a(24) =32032045540a(25) =88455119858a(26) =244265061492a(27) =674527681575