Number of reduced words of length n in the Weyl group B_11.

Terms

a(0) =1a(1) =11a(2) =65a(3) =275a(4) =934a(5) =2706a(6) =6941a(7) =16159a(8) =34749a(9) =69927a(10) =132991a(11) =240901a(12) =418198a(13) =699258a(14) =1130856a(15) =1774992a(16) =2711907a(17) =4043193a(18) =5894878a(19) =8420346a(20) =11802934a(21) =16258034a(22) =22034519a(23) =29415309a(24) =38716897a(25) =50287667a(26) =64504857a(27) =81770051