Number of reduced words of length n in the Weyl group A_26.

Terms

a(0) =1a(1) =26a(2) =350a(3) =3249a(4) =23373a(5) =138853a(6) =708903a(7) =3196324a(8) =12981645a(9) =48206991a(10) =165596757a(11) =531131433a(12) =1602738098a(13) =4579020513a(14) =12451908378a(15) =32375259017a(16) =80796089046a(17) =194191143975a(18) =450825834354