Number of permutations of [n] having exactly three (possibly overlapping) doubledescents.

A279292

Number of permutations of [n] having exactly three (possibly overlapping) doubledescents.

Terms

    a(0) =1a(1) =10a(2) =167a(3) =2064a(4) =28143a(5) =374166a(6) =5227491a(7) =75105984a(8) =1127851278a(9) =17625022976a(10) =287569327286

External references