Number of length n inversion sequences avoiding the patterns 000 and 100.

A279564

Number of length n inversion sequences avoiding the patterns 000 and 100.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =60a(6) =260a(7) =1267a(8) =6850a(9) =40572a(10) =260812a(11) =1805646a(12) =13377274a(13) =105487540a(14) =881338060a(15) =7770957903a(16) =72060991394a(17) =700653026744

External references