login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A268645 Union of the factorial numbers (A000142) and the double factorials numbers (A006882). 1
1, 2, 3, 6, 8, 15, 24, 48, 105, 120, 384, 720, 945, 3840, 5040, 10395, 40320, 46080, 135135, 362880, 645120, 2027025, 3628800, 10321920, 34459425, 39916800, 185794560, 479001600, 654729075, 3715891200, 6227020800, 13749310575, 81749606400, 87178291200, 316234143225, 1307674368000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

Douglas Hoftstadter, Keynote lecture, DIMACS Workshop on Recognition of Integer Sequences, Oct. 10, 2014.

LINKS

Table of n, a(n) for n=1..36.

Abstract of D. Hoftstadter in the Workshop's program

CROSSREFS

Cf. A000142, A006882.

See A248652 for another version.

Sequence in context: A129374 A209405 A048809 * A047001 A174021 A267007

Adjacent sequences:  A268642 A268643 A268644 * A268646 A268647 A268648

KEYWORD

nonn

AUTHOR

Olivier Gérard, Oct 10 2014, revised by N. J. A. Sloane, Feb 09 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 25 03:06 EST 2018. Contains 299630 sequences. (Running on oeis4.)