Number of permutations of length n with exactly 3 occurrences of the pattern 2-13.
A094219
Number of permutations of length n with exactly 3 occurrences of the pattern 2-13.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =7a(5) =112a(6) =1092a(7) =8400a(8) =56100a(9) =341088a(10) =1939938a(11) =10498488a(12) =54679625a(13) =276276000a(14) =1362040680a(15) =6580248480a(16) =31256180280a(17) =146350008000a(18) =676868787000
External references
- oeis: A094219