A177328 Number of permutations of n copies of 1..7 with all adjacent differences <= 3 in absolute value.

1, 428, 6068622, 171548183912, 6595449547140990, 302061042944500510428, 15490059482899736687180550, 859754565449162833823191994960, 50593398455336474751923402897514750, 3114239698138241536925385754973336892980, 198659268102792043540362525905723850226165122

Offset

0,2

Links

Martin Fuller, Table of n, a(n) for n = 0..11

Crossrefs

Sequence in context: A173798 A233812 A231047 * A243833 A334558 A320712

Adjacent sequences: A177325 A177326 A177327 * A177329 A177330 A177331

Keyword

nonn

Author

R. H. Hardin, May 06 2010

Extensions

a(0) and a(6) from Alois P. Heinz, Jan 20 2020

a(7) onwards from Martin Fuller, Jun 07 2025

Status

approved