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A248652 Union of the factorial numbers (A000142) and the double factorials of odd numbers (A001147). 2
1, 2, 3, 6, 15, 24, 105, 120, 720, 945, 5040, 10395, 40320, 135135, 362880, 2027025, 3628800, 34459425, 39916800, 479001600, 654729075, 6227020800, 13749310575, 87178291200, 316234143225, 1307674368000, 7905853580625, 20922789888000, 213458046676875, 355687428096000 (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..30.

Abstract of D. Hoftstadter in the Workshop's program

CROSSREFS

Cf. A000142, A001147, A005214.

See A268645 for another version.

Sequence in context: A066653 A081945 A255353 * A158027 A100249 A138477

Adjacent sequences:  A248649 A248650 A248651 * A248653 A248654 A248655

KEYWORD

nonn

AUTHOR

Olivier Gérard, Oct 10 2014

EXTENSIONS

Revised by N. J. A. Sloane, Feb 09 2016

STATUS

approved

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Last modified February 24 14:41 EST 2018. Contains 299623 sequences. (Running on oeis4.)