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A215460 Floor(n!^2 / n^n). 0
1, 1, 1, 2, 4, 11, 30, 96, 339, 1316, 5584, 25733, 128025, 683949, 3905083, 23731187, 152934464, 1041782238, 7479469995, 56448098958, 446768591341, 3700276748921, 32007269639380, 288630046441757, 2708888570942365, 26419890078249485, 267389254029561667 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

a(4) = Floor((4!)^2 / (4^4)) = Floor(24^2 / 256) = Floor(2.25) = 2.

PROG

(Python)

f = 1

for n in range(1, 33):

    print f*f // n**n,

    f *= n+1

CROSSREFS

Cf. A064546, A063709, A055775.

Sequence in context: A148157 A141268 A135527 * A339225 A148158 A148159

Adjacent sequences:  A215457 A215458 A215459 * A215461 A215462 A215463

KEYWORD

nonn

AUTHOR

Alex Ratushnyak, Aug 11 2012

STATUS

approved

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Last modified September 18 17:56 EDT 2021. Contains 347532 sequences. (Running on oeis4.)