Number of reduced words of length n in the Weyl group B_13.

Terms

a(0) =1a(1) =13a(2) =90a(3) =442a(4) =1728a(5) =5720a(6) =16653a(7) =43745a(8) =105586a(9) =237354a(10) =502113a(11) =1007773a(12) =1931631a(13) =3554747a(14) =6308719a(15) =10837683a(16) =18078554a(17) =29362618a(18) =46541560a(19) =72140848a(20) =109543070a(21) =163203326a(22) =238898101a(23) =344008185a(24) =487835165a(25) =681949801a(26) =940569228a(27) =1280958420a(28) =1723849738a(29) =2293872698