Number of indecomposable permutations avoiding the pattern 1234.

A284719

Number of indecomposable permutations avoiding the pattern 1234.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =13a(4) =69a(5) =400a(6) =2390a(7) =14545a(8) =90285a(9) =572801a(10) =3715919a(11) =24627773a(12) =166497633a(13) =1146141359a(14) =8019377521a(15) =56936916951a(16) =409590294555

External references