Number of standard Young tableaux of n cells and height >= 3.

Terms

a(0) =1a(1) =4a(2) =16a(3) =56a(4) =197a(5) =694a(6) =2494a(7) =9244a(8) =35234a(9) =139228a(10) =566788a(11) =2387048a(12) =10343101a(13) =46193866a(14) =211775002a(15) =997265204a(16) =4809609062a(17) =23758479340a(18) =119952340180a(19) =618883933480