Number of irreducible positions of size n in Montreal solitaire.

Terms

a(0) =1a(1) =3a(2) =9a(3) =25a(4) =70a(5) =194a(6) =537a(7) =1485a(8) =4104a(9) =11338a(10) =31318a(11) =86498a(12) =238885a(13) =659713a(14) =1821843a(15) =5031071a(16) =13893316a(17) =38366206a(18) =105947374a(19) =292570493a(20) =807923428a(21) =2231050832a(22) =6160961041a(23) =17013250192a(24) =46981405457a(25) =129737238488a(26) =358264064448a(27) =989331456469