Number of reduced words of length n in the Weyl group D_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) =3554746a(14) =6308706a(15) =10837593a(16) =18078112a(17) =29360890a(18) =46535840a(19) =72124195a(20) =109499325a(21) =163097740a(22) =238660747a(23) =343506072a(24) =486827392a(25) =680018170a(26) =937014482a(27) =1274649714