User blog comment:Googleaarex/Factorial N-ational/@comment-25371339-20140918003952/@comment-5029411-20140918122334

Extension!

n!1(2)2 = n!1,1...1,1,2 with n 1's

n!1(2)3 = n!1,1...1,1,2(2)2 with n 1's on first row

n!1(2)1(2)2 = n!1(2)1,1...1,1,2 with n 1's on second row

n!1(3)2 = n!1(2)1...1(2)1(2)2 with n 1's