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Number of permutations of 1..n with both permutation and its inverse having exactly 2 maxima
0

%I #3 Mar 31 2012 12:35:46

%S 0,0,1,12,66,248,739,1880,4260,8832,17061,31108,54054,90168,145223,

%T 226864

%N Number of permutations of 1..n with both permutation and its inverse having exactly 2 maxima

%K nonn

%O 1,4

%A _R. H. Hardin_ Sep 01 2010