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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. 2
1, 2, 6, 8, 24, 168, 840, 1008, 4032, 32160, 192960, 1297440, 9082080, 126846720, 1141620480, 1243468800, 4490307360, 53812332000, 526257365760, 3736568586240 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Suggested by Leroy Quet.

LINKS

Table of n, a(n) for n=1..20.

CROSSREFS

Cf. A115507, A115508.

Sequence in context: A189850 A189358 A116083 * A243552 A057852 A180814

Adjacent sequences:  A115503 A115504 A115505 * A115507 A115508 A115509

KEYWORD

nonn,more

AUTHOR

Max Alekseyev, Jan 31 2006

STATUS

approved

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Last modified April 9 07:40 EDT 2020. Contains 333344 sequences. (Running on oeis4.)