The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #3 Mar 31 2012 12:35:44
%S 1,20,1665,356520,155809035,121055807700,152393963368875,
%T 290740199232531840
%N Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, up, down, down
%K nonn
%O 1,2
%A _R. H. Hardin_ May 10 2010