# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a019437 Showing 1-1 of 1 %I A019437 #6 Mar 30 2012 16:46:30 %S A019437 1,3,6,120, %T A019437 9290976268679343135539052852903295259378814351580596958743987989307824385062448596342880785099979140705774497073908459100742234151955724805414557103318958341618000723968000000000000000000000000000 %N A019437 a(n) = a(n-1)!/a(n-2)!; a(0) = 1, a(1) = 3. %K A019437 nonn %O A019437 0,2 %A A019437 _N. J. A. Sloane_, Dec 21 2001 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE