Number of length n inversion sequences avoiding the patterns 010, 101, 120, 201, and 210.

A279554

Number of length n inversion sequences avoiding the patterns 010, 101, 120, 201, and 210.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =51a(6) =188a(7) =733a(8) =2979a(9) =12495a(10) =53708a(11) =235396a(12) =1048168a(13) =4728757a(14) =21569339a(15) =99309057a(16) =460932778a(17) =2154402107a(18) =10131719847a(19) =47906876978a(20) =227620982129

External references