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A135609
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a(n) = (n!)^2 - n^n.
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1
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0, 0, 0, 9, 320, 11275, 471744, 24578057, 1608925184, 131294473911, 13158189440000, 1593065610569389, 229433616702111744, 38775485168526047747, 7600043344545171881984, 1710011814830309043140625, 437763118250650978834448384, 126513545678306908298879235823
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OFFSET
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0,4
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COMMENTS
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a(n) > 0 for n>2.
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REFERENCES
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C. Smith, A Treatise on Algebra, Macmillan, London, 5th ed., 1950, p. 445.
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LINKS
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G. C. Greubel, Table of n, a(n) for n = 0..100
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FORMULA
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a(n) = A001044(n) - A000312(n). - Michel Marcus, Oct 23 2016
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MATHEMATICA
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Join[{0}, Table[(n!)^2 - n^n, {n, 1, 25}]] (* G. C. Greubel, Oct 22 2016 *)
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PROG
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(MAGMA) [Factorial(n)^2-n^n: n in [0..20]]; // Vincenzo Librandi, Oct 23 2016
(PARI) a(n) = (n!)^2 - n^n; \\ Michel Marcus, Oct 23 2016
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CROSSREFS
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Cf. A001044, A000312.
Sequence in context: A288324 A317634 A198401 * A349287 A277422 A266065
Adjacent sequences: A135606 A135607 A135608 * A135610 A135611 A135612
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Mar 02 2008
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STATUS
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approved
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