Number of standard Young tableaux of shape [3n,3].

Terms

a(0) =0a(1) =5a(2) =48a(3) =154a(4) =350a(5) =663a(6) =1120a(7) =1748a(8) =2574a(9) =3625a(10) =4928a(11) =6510a(12) =8398a(13) =10619a(14) =13200a(15) =16168a(16) =19550a(17) =23373a(18) =27664a(19) =32450a(20) =37758a(21) =43615a(22) =50048a(23) =57084a(24) =64750a(25) =73073a(26) =82080a(27) =91798a(28) =102254a(29) =113475