Number of length n inversion sequences avoiding the patterns 102 and 210.

A374542

Number of length n inversion sequences avoiding the patterns 102 and 210.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =87a(6) =351a(7) =1416a(8) =5681a(9) =22660a(10) =89961a(11) =355924a(12) =1404839a(13) =5536143a(14) =21794634a(15) =85749490a(16) =337271186a(17) =1326421512a(18) =5216761708a(19) =20520185594a(20) =80733298320a(21) =317713643536

External references