Number of permutations of order n avoiding the consecutive pattern 131'2.
A177475
Number of permutations of order n avoiding the consecutive pattern 131'2.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =81a(6) =390a(7) =2161a(8) =13678a(9) =96983a(10) =764368a(11) =6630898a(12) =62748250a(13) =643442919a(14) =7104914398a(15) =84062375725
External references
- oeis: A177475