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A115506
Number of permutations where every element in binary notation has ones at the same or adjacent positions of previous element's binary ones.
3
1, 2, 6, 8, 24, 168, 840, 1008, 4032, 32160, 192960, 1297440, 9082080, 126846720, 1141620480, 1243468800, 4490307360, 53812332000, 526257365760, 3736568586240, 33629117276160, 539852417395200, 5938376591347200, 43328496719692800, 612865454506905600, 12864962752408166400, 204270526971128217600, 2666714307922074009600, 40000714618831110144000
OFFSET
1,2
COMMENTS
Suggested by Leroy Quet.
CROSSREFS
KEYWORD
nonn
AUTHOR
Max Alekseyev, Jan 31 2006
EXTENSIONS
a(21)-a(29) from Max Alekseyev, Mar 21 2023
STATUS
approved