Number of irreducible positions of size n in Montreal solitaire.

Terms

a(0) =1a(1) =2a(2) =7a(3) =21a(4) =57a(5) =162a(6) =452a(7) =1255a(8) =3474a(9) =9621a(10) =26604a(11) =73531a(12) =203166a(13) =561242a(14) =1550216a(15) =4281502a(16) =11824338a(17) =32654467a(18) =90177615a(19) =249028277a(20) =687692923a(21) =1899056307a(22) =5244202459a(23) =14481714130a(24) =39990771798a(25) =110433069740a(26) =304956719409a(27) =842126002534