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Number of permutations of 7 copies of 1..n with all adjacent differences <= 3 in absolute value.
0

%I #5 Mar 02 2016 11:20:10

%S 1,1,3432,399072960,472518347558400,102038786510159790720,

%T 9792481437399343532438160

%N Number of permutations of 7 copies of 1..n with all adjacent differences <= 3 in absolute value.

%C a(n) = (7n)!/5040^n for n<=4.

%Y Cf. A172603.

%K nonn

%O 0,3

%A _R. H. Hardin_, May 06 2010