Number of permutations of length n avoiding the pattern 1324 and with 1 appearing before n.
A372310
Number of permutations of length n avoiding the pattern 1324 and with 1 appearing before n.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =45a(4) =198a(5) =919a(6) =4446a(7) =22239a(8) =114347a(9) =601722a(10) =3229614a(11) =17632437a(12) =97707195a(13) =548538588a(14) =3115293151a(15) =17875151109a(16) =103511938302a(17) =604392787819
External references
- oeis: A372310