Norm of a matrix.

Terms

a(0) =1a(1) =2a(2) =8a(3) =48a(4) =256a(5) =1280a(6) =6912a(7) =39424a(8) =212992a(9) =1118208a(10) =6553600a(11) =36765696a(12) =199229440a(13) =1133117440a(14) =6499598336a(15) =36175872000a(16) =200655503360