Number of reduced words of length n in the Weyl group D_10.

Terms

a(0) =1a(1) =10a(2) =54a(3) =210a(4) =659a(5) =1772a(6) =4235a(7) =9218a(8) =18590a(9) =35178a(10) =63063a(11) =107900a(12) =177243a(13) =280850a(14) =430939a(15) =642364a(16) =932680a(17) =1322068a(18) =1833095a(19) =2490290a(20) =3319525a(21) =4347200a(22) =5599243a(23) =7099950a(24) =8870703a(25) =10928616a(26) =13285169a(27) =15944898a(28) =18904214a(29) =22150426