Number of permutations of length n with two 3-sequences.
A002630
Number of permutations of length n with two 3-sequences.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =12a(6) =71a(7) =481a(8) =3708a(9) =32028a(10) =306723a(11) =3228804a(12) =37080394a(13) =461569226a(14) =6192527700a(15) =89102492915
External references
- oeis: A002630