Number of permutations of length n containing exactly 1 occurrence of 1234 and 1 occurrence of 1243.
A224293
Number of permutations of length n containing exactly 1 occurrence of 1234 and 1 occurrence of 1243.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =2a(6) =32a(7) =322a(8) =2634a(9) =19216a(10) =130662a(11) =848284a(12) =5334332a(13) =32788726a(14) =198201268a(15) =1183152686a(16) =6995479542a(17) =41055940756a(18) =239560353258
External references
- oeis: A224293