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%I #13 May 16 2020 01:33:56
%S 1,1,3432,623576,201922730,48203722464,11408205434138,
%T 2535604038015218,546641872918476120,114573118435555703030,
%U 23513682407867601161354,4742254932865402388419776,942857462878069039167940082,185226548794692635344238756018,36021105095432337381819132791160
%N Number of permutations of 7 copies of 1..n with all adjacent differences <= 1 in absolute value.
%C a(n) = (7n)!/5040^n = A172603(n) for n<=2.
%H Andrew Howroyd, <a href="/A177307/b177307.txt">Table of n, a(n) for n = 0..200</a>
%Y Column k=7 of A331562.
%Y Cf. A172603.
%K nonn
%O 0,3
%A _R. H. Hardin_, May 06 2010
%E a(0)=1 prepended by _Alois P. Heinz_, Jan 21 2020
%E Terms a(8) and beyond from _Andrew Howroyd_, May 15 2020
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