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A177307
Number of permutations of 7 copies of 1..n with all adjacent differences <= 1 in absolute value.
2
1, 1, 3432, 623576, 201922730, 48203722464, 11408205434138, 2535604038015218, 546641872918476120, 114573118435555703030, 23513682407867601161354, 4742254932865402388419776, 942857462878069039167940082, 185226548794692635344238756018, 36021105095432337381819132791160
OFFSET
0,3
COMMENTS
a(n) = (7n)!/5040^n = A172603(n) for n<=2.
LINKS
CROSSREFS
Column k=7 of A331562.
Cf. A172603.
Sequence in context: A024751 A024759 A245860 * A140911 A351486 A362172
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Jan 21 2020
Terms a(8) and beyond from Andrew Howroyd, May 15 2020
STATUS
approved