Number of reduced words of length n in the Weyl group B_25.

Terms

a(0) =1a(1) =25a(2) =324a(3) =2900a(4) =20149a(5) =115805a(6) =572975a(7) =2507895a(8) =9904050a(9) =35818770a(10) =120016066a(11) =376029250a(12) =1110031585a(13) =3106677225a(14) =8286768736a(15) =21161266240a(16) =51931463950a(17) =122883804990a(18) =281186004075a(19) =623785796595