Number of reduced words of length n in the Weyl group A_12.

Terms

a(0) =1a(1) =12a(2) =77a(3) =351a(4) =1274a(5) =3914a(6) =10569a(7) =25728a(8) =57486a(9) =119483a(10) =233389a(11) =431886a(12) =762007a(13) =1288587a(14) =2097472a(15) =3298033a(16) =5024460a(17) =7435284a(18) =10710609a(19) =15046642a(20) =20647290a(21) =27712842a(22) =36426054a(23) =46936280a(24) =59342609a(25) =73677240a(26) =89890517a(27) =107839121a(28) =127278852a(29) =147863220