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1/16 the number of permutations of 0..n having exactly 4 maxima.
0

%I #6 Mar 01 2015 15:02:38

%S 0,0,0,0,0,0,17,496,8576,115072,1328336,13899904,135927040,1266360320,

%T 11385790720,99682672640,855303553024,7226263666688,60329459699712,

%U 499027284295680

%N 1/16 the number of permutations of 0..n having exactly 4 maxima.

%F a(n) = A000517(n+1)/16. - _R. J. Mathar_, Mar 01 2015

%Y Cf. A100575.

%K nonn

%O 0,7

%A _R. H. Hardin_, Aug 11 2007