Number of Young tableaux with n cells whose shape is symmetric.

Terms

a(0) =1a(1) =1a(2) =0a(3) =2a(4) =2a(5) =6a(6) =16a(7) =20a(8) =132a(9) =112a(10) =1216a(11) =1440a(12) =12440a(13) =25520a(14) =138048a(15) =476320a(16) =1649312a(17) =9138300a(18) =21842944a(19) =182232248a(20) =345145392a(21) =3805004296a(22) =7002149760a(23) =83299368432a(24) =180168275232