Number of permutations of an n-sequence discordant with three given permutations (see reference) in n-4 places.

A000440

Number of permutations of an n-sequence discordant with three given permutations (see reference) in n-4 places.

Terms

    a(0) =9a(1) =30a(2) =180a(3) =980a(4) =8326a(5) =70272a(6) =695690a(7) =7518720a(8) =89193276a(9) =1148241458a(10) =15947668065a(11) =237613988040

External references