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Number of permutations of 1..2*n+9 with no adjacent elements within n in value.
1

%I #11 Dec 01 2018 19:35:09

%S 362880,5296790,88422296,1634227958,32096768008,649347224736

%N Number of permutations of 1..2*n+9 with no adjacent elements within n in value.

%K nonn,more

%O 0,1

%A _R. H. Hardin_, Aug 03 2010

%E a(0)=362880 prepended by _Seiichi Manyama_, Dec 01 2018