Square root of largest square dividing n!.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =12a(6) =12a(7) =24a(8) =72a(9) =720a(10) =720a(11) =1440a(12) =1440a(13) =10080a(14) =30240a(15) =120960a(16) =120960a(17) =725760a(18) =725760a(19) =7257600a(20) =7257600a(21) =79833600a(22) =79833600a(23) =958003200a(24) =4790016000a(25) =62270208000a(26) =186810624000