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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
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`%S 1,1,3432,399072960,472518347558400,102038786510159790720,
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`%T 9792481437399343532438160
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`%N Number of permutations of 7 copies of 1..n with all adjacent differences <= 3 in absolute value.
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`%C a(n) = (7n)!/5040^n for n<=4.
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`%Y Cf. A172603.
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`%K nonn
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`%O 0,3
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`%A _R. H. Hardin_, May 06 2010
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