Number of quasi-alternating permutations of length n.
A001758
Number of quasi-alternating permutations of length n.
Terms
- a(0) =0a(1) =2a(2) =12a(3) =58a(4) =300a(5) =1682a(6) =10332a(7) =69298a(8) =505500a(9) =3990362a(10) =33925452a(11) =309248938a(12) =3010070700a(13) =31167995042a(14) =342164637372
External references
- oeis: A001758