Coefficient triangle of the Hermite-Bell polynomials for power -2.

Terms

a(0) =1a(1) =2a(2) =4a(3) =-6a(4) =8a(5) =-36a(6) =24a(7) =16a(8) =-144a(9) =300a(10) =-120a(11) =32a(12) =-480a(13) =2040a(14) =-2640a(15) =720a(16) =64a(17) =-1440a(18) =10320a(19) =-27720a(20) =25200a(21) =-5040a(22) =128a(23) =-4032a(24) =43680a(25) =-199920a(26) =383040a(27) =-262080a(28) =40320a(29) =256