Number of permutations of length n which avoid the patterns 3214, 4123, 4132.

A116738

Number of permutations of length n which avoid the patterns 3214, 4123, 4132.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =21a(4) =74a(5) =260a(6) =913a(7) =3206a(8) =11258a(9) =39533a(10) =138822a(11) =487480a(12) =1711809a(13) =6011098a(14) =21108254a(15) =74122629a(16) =260285106a(17) =914003420a(18) =3209566097a(19) =11270542654a(20) =39577041842a(21) =138976648157a(22) =488023051598

External references