Numerator of Hermite(n, 2/3).

Terms

a(0) =1a(1) =4a(2) =-2a(3) =-152a(4) =-500a(5) =8944a(6) =80776a(7) =-642848a(8) =-12749168a(9) =41573440a(10) =2231658976a(11) =1443416704a(12) =-436094810432