Number of permutations of length n which avoid the patterns 1234, 1342, 1432.
A116798
Number of permutations of length n which avoid the patterns 1234, 1342, 1432.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =76a(5) =277a(6) =1012a(7) =3702a(8) =13553a(9) =49642a(10) =181885a(11) =666542a(12) =2442922a(13) =8954133a(14) =32821408a(15) =120310377a(16) =441018216a(17) =1616644946a(18) =5926191305a(19) =21723934190a(20) =79634709513a(21) =291922123258
External references
- oeis: A116798