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The first four terms of the sequence are doubled, then those numbers are tripled and then those numbers are quadrupled, etc.
2

%I #5 Oct 31 2013 12:17:37

%S 2,4,6,8,4,8,12,16,12,24,36,48,48,96,144,192,240,480,720,960,1440,

%T 2880,4320,5760,10080,20160,30240,40320,80640,161280,241920,322560,

%U 725760,1451520,2177280,2903040,7257600,14515200,21772800,29030400,79833600

%N The first four terms of the sequence are doubled, then those numbers are tripled and then those numbers are quadrupled, etc.

%t Table[n!{2, 4, 6, 8}, {n, 11}] // Flatten (* _Robert G. Wilson v_ *)

%K nonn

%O 0,1

%A Albert S. Castillo (roadraptor(AT)sbcglobal.net), Mar 08 2006

%E More terms from _Robert G. Wilson v_, Apr 12 2006