|
%I #3 Mar 31 2012 12:35:44
%S 1,3,30,246,5400,134550,5380020,379593000,18277228800,1895009299200,
%T 171982733220000,21945548042928000
%N Number of permutations of 2 copies of 1..n with no element e[i>=2]<e[1+floor((i-2)/5)] (5-way heap)
%Y Simple 2-way heap A056971
%K nonn
%O 1,2
%A _R. H. Hardin_ May 17 2010
|
