Number of rectangular standard Young tableaux with n cells.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =2a(5) =12a(6) =2a(7) =30a(8) =44a(9) =86a(10) =2a(11) =1190a(12) =2a(13) =860a(14) =12014a(15) =26886a(16) =2a(17) =184758a(18) =2a(19) =3359202a(20) =2771342a(21) =117574a(22) =2a(23) =327618902a(24) =701149022a(25) =1485802a(26) =828630662a(27) =27350160662a(28) =2a(29) =808310933492