Number of reduced words of length n in the Weyl group B_22.

Terms

a(0) =1a(1) =22a(2) =252a(3) =2002a(4) =12396a(5) =63734a(6) =283107a(7) =1116236a(8) =3983485a(9) =13057330a(10) =39764011a(11) =113533312a(12) =306173263a(13) =784654154a(14) =1920802566a(15) =4510960122a(16) =10201294213a(17) =22286443124a(18) =47167714715a(19) =96947735390a(20) =193938666735a(21) =378324531180a(22) =720920510115