Number of permutations w in S_n that form Boolean intervals [s, w] in the Bruhat order for every simple reflection s in the support of w.

A331347

Number of permutations w in S_n that form Boolean intervals [s, w] in the Bruhat order for every simple reflection s in the support of w.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =15a(4) =37a(5) =93a(6) =238a(7) =616a(8) =1604a(9) =4189a(10) =10955a(11) =28667a(12) =75036a(13) =196430a(14) =514242a(15) =1346283a(16) =3524593a(17) =9227481a(18) =24157834a(19) =63246004a(20) =165580160a(21) =433494457a(22) =1134903191a(23) =2971215095a(24) =7778742072a(25) =20365011098a(26) =53316291198a(27) =139583862471a(28) =365435296189a(29) =956722026069

External references