Number of reduced words of length n in the Weyl group B_7.

Terms

a(0) =1a(1) =7a(2) =27a(3) =77a(4) =181a(5) =371a(6) =686a(7) =1170a(8) =1869a(9) =2827a(10) =4082a(11) =5662a(12) =7581a(13) =9835a(14) =12399a(15) =15225a(16) =18242a(17) =21358a(18) =24464a(19) =27440a(20) =30162a(21) =32510a(22) =34376a(23) =35672a(24) =36336a(25) =36336a(26) =35672a(27) =34376a(28) =32510a(29) =30162