Number of reduced words of length n in the Weyl group A_9.

Terms

a(0) =1a(1) =9a(2) =44a(3) =155a(4) =440a(5) =1068a(6) =2298a(7) =4489a(8) =8095a(9) =13640a(10) =21670a(11) =32683a(12) =47043a(13) =64889a(14) =86054a(15) =110010a(16) =135853a(17) =162337a(18) =187959a(19) =211089a(20) =230131a(21) =243694a(22) =250749a(23) =250749a(24) =243694a(25) =230131a(26) =211089a(27) =187959a(28) =162337a(29) =135853