Number of reduced words of length n in the Weyl group D_9.

Terms

a(0) =1a(1) =9a(2) =44a(3) =156a(4) =449a(5) =1113a(6) =2463a(7) =4983a(8) =9372a(9) =16587a(10) =27877a(11) =44802a(12) =69231a(13) =103314a(14) =149425a(15) =210075a(16) =287796a(17) =384999a(18) =503812a(19) =645906a(20) =812319a(21) =1003290a(22) =1218116a(23) =1455045a(24) =1711216a(25) =1982655a(26) =2264333a(27) =2550288a(28) =2833809a(29) =3107676