A177307 Number of permutations of 7 copies of 1..n with all adjacent differences <= 1 in absolute value.

1, 1, 3432, 623576, 201922730, 48203722464, 11408205434138, 2535604038015218, 546641872918476120, 114573118435555703030, 23513682407867601161354, 4742254932865402388419776, 942857462878069039167940082, 185226548794692635344238756018, 36021105095432337381819132791160

Offset: 0

Author

R. H. Hardin, May 06 2010

Keywords

• nonn

Comments

a(n) = (7n)!/5040^n = A172603(n) for n<=2.

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..200

Crossrefs

Column k=7 of A331562.

Cf. A172603.

Extensions

a(0)=1 prepended by Alois P. Heinz, Jan 21 2020

Terms a(8) and beyond from Andrew Howroyd, May 15 2020