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A228448
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floor(n! / 3^n).
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0
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1, 0, 0, 0, 0, 0, 0, 2, 6, 18, 61, 225, 901, 3905, 18226, 91134, 486048, 2754274, 16525645, 104662422, 697749481, 4884246371, 35817806721, 274603184861, 2196825478892, 18306878990770, 158659617920008, 1427936561280078, 13327407905280733, 128831609751047086
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,8
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LINKS
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Table of n, a(n) for n=0..29.
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MATHEMATICA
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Table[Floor[n!/3^n], {n, 0, 30}] (* Harvey P. Dale, May 24 2018 *)
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PROG
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(Python)
import math
for n in range(99): print str(math.factorial(n)/(3**n))+', ',
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CROSSREFS
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Cf. A000142, A066979, A212309.
Sequence in context: A150051 A148462 A123639 * A177473 A177471 A303117
Adjacent sequences: A228445 A228446 A228447 * A228449 A228450 A228451
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KEYWORD
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nonn,less
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AUTHOR
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Alex Ratushnyak, Oct 27 2013
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STATUS
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approved
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