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A115508 Number of permutations where for every pair of adjacent elements one element in binary notation has ones at the same or adjacent positions to those of the other element. 2
1, 2, 6, 4, 4, 40, 120, 72, 140, 824, 3312, 22320, 110976, 1369536, 9477120, 3596160, 3235584, 36927360, 286846848, 700001376, 3321184800, 41563274304, 279121008576, 3155690872704, 40885093117440, 827391601336320, 11517247876055040, 76396291822448640, 822435518222438400 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A323482 A057143 A087428 * A348669 A195730 A222236
KEYWORD
nonn
AUTHOR
Max Alekseyev, Jan 31 2006
EXTENSIONS
a(21)-a(29) from Max Alekseyev, Mar 21 2023
STATUS
approved

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Last modified July 22 23:28 EDT 2024. Contains 374544 sequences. (Running on oeis4.)