Number of Young tableaux with n=i*j cells and type i*j matrices with i>=j.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =6a(6) =1a(7) =15a(8) =43a(9) =43a(10) =1a(11) =595a(12) =1a(13) =430a(14) =6007a(15) =25455a(16) =1a(17) =92379a(18) =1a(19) =1679601a(20) =1385671a(21) =58787a(22) =1a(23) =163809451a(24) =701149021a(25) =742901a(26) =414315331a(27) =13675080331a(28) =1a(29) =404155466746