Number of permutations of {1,2,...,n} containing exactly 4 occurrences of the 132 pattern.
A138162
Number of permutations of {1,2,...,n} containing exactly 4 occurrences of the 132 pattern.
Terms
- a(0) =12a(1) =96a(2) =526a(3) =2593a(4) =12165a(5) =55482a(6) =248509a(7) =1099255a(8) =4817998a(9) =20968680a(10) =90747564a(11) =390927869a(12) =1677551078a(13) =7174848666a(14) =30598014925a(15) =130155932685a(16) =552386655300
External references
- oeis: A138162