Number of reduced words of length n in the Weyl group A_22.

Terms

a(0) =1a(1) =22a(2) =252a(3) =2001a(4) =12374a(5) =63481a(6) =281083a(7) =1103587a(8) =3917728a(9) =12761596a(10) =38582270a(11) =109256095a(12) =291946589a(13) =740676682a(14) =1793325939a(15) =4161927624a(16) =9293159292a(17) =20029728894a(18) =41788665040a(19) =84604366100a(20) =166583279325a(21) =319610939055a(22) =598577118991