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

Terms

a(0) =0a(1) =0a(2) =2a(3) =2a(4) =8a(5) =20a(6) =60a(7) =212a(8) =632a(9) =2508a(10) =8280a(11) =34256a(12) =127712a(13) =542984a(14) =2252432a(15) =9873216a(16) =44557424a(17) =202661012a(18) =975470880a(19) =4627469192a(20) =23413518704a(21) =116147688600a(22) =611882489152