Number of indecomposable permutations avoiding the pattern 4231.

A284713

Number of indecomposable permutations avoiding the pattern 4231.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =12a(4) =56a(5) =289a(6) =1604a(7) =9415a(8) =57801a(9) =368269a(10) =2421115a(11) =16352401a(12) =113075441a(13) =798316997a(14) =5741446395a(15) =41984708298a(16) =311673028845

External references