Number of permutations in S_n containing exactly 2 increasing subsequences of length 4.
A224249
Number of permutations in S_n containing exactly 2 increasing subsequences of length 4.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =4a(5) =63a(6) =665a(7) =5982a(8) =49748a(9) =396642a(10) =3089010a(11) =23745117a(12) =181282899a(13) =1379847138a(14) =10496697584a(15) =79928658289a(16) =609847716251
External references
- oeis: A224249