Number of indecomposable permutations avoiding the pattern 4321.

A284712

Number of indecomposable permutations avoiding the pattern 4321.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =12a(4) =56a(5) =289a(6) =1603a(7) =9391a(8) =57437a(9) =363773a(10) =2371551a(11) =15842850a(12) =108070370a(13) =750655459a(14) =5297314241a(15) =37909476912a(16) =274693258884

External references