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A177657 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, down, down. 0
1, 1, 70, 34650, 63063000, 305540235000, 3244612572406800, 66346172137847738628 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
Table of n, a(n) for n=0..7.
CROSSREFS
Cf. A014608.
Sequence in context: A177670 A177671 A177656 * A177676 A014608 A185401
Adjacent sequences: A177654 A177655 A177656 * A177658 A177659 A177660
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
STATUS
approved

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Last modified June 3 22:50 EDT 2024. Contains 373088 sequences. (Running on oeis4.)