Number of reduced words of length n in the Weyl group D_26.

Terms

a(0) =1a(1) =26a(2) =350a(3) =3250a(4) =23399a(5) =139204a(6) =712179a(7) =3220074a(8) =13124124a(9) =48942894a(10) =168958960a(11) =544988210a(12) =1655019795a(13) =4761697020a(14) =13048465756a(15) =34209731996a(16) =86141195946a(17) =209025000936a(18) =490211005011