Determinant of the n-th principal submatrix of A204237.

Terms

a(0) =2a(1) =-17a(2) =104a(3) =-560a(4) =2816a(5) =-13568a(6) =63488a(7) =-290816a(8) =1310720a(9) =-5832704a(10) =25690112a(11) =-112197632a(12) =486539264a(13) =-2097152000a(14) =8992587776a(15) =-38386270208a(16) =163208757248a(17) =-691489734656