Number of permutations of length n which avoid the patterns 1423, 1432, 3241.

A116790

Number of permutations of length n which avoid the patterns 1423, 1432, 3241.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =21a(4) =74a(5) =256a(6) =880a(7) =3025a(8) =10406a(9) =35805a(10) =123197a(11) =423881a(12) =1458425a(13) =5017929a(14) =17264954a(15) =59402739a(16) =204384285a(17) =703215622a(18) =2419521666a(19) =8324736993a(20) =28642540011a(21) =98549071193a(22) =339073260558

External references