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URL: https://oeis.org/A057065

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A057065
a(n) = floor(n^n/2).
5
0, 0, 2, 13, 128, 1562, 23328, 411771, 8388608, 193710244, 5000000000, 142655835305, 4458050224128, 151437553296126, 5556003412779008, 218946945190429687, 9223372036854775808, 413620130943168382088, 19673204037648268787712, 989209827830156794561989
OFFSET
0,3
LINKS
FORMULA
a(n) = floor( A000312(n)/2 ).
EXAMPLE
a(5) = floor(5^5/2) = floor(3125/2) = 1562.
MATHEMATICA
Join[{0}, Table[Floor[n^n/2], {n, 20}]] (* Harvey P. Dale, May 19 2012 *)
PROG
(SageMath) [floor(n^n/2) for n in range(0, 17)] # Zerinvary Lajos, Dec 02 2009
(PARI) a(n) = n^n\2; \\ Michel Marcus, Feb 18 2016
(Magma) [Floor(n^n/2): n in [0..20]]; // Vincenzo Librandi, Feb 18 2016
CROSSREFS
Cf. A000312.
Sequence in context: A108471 A036078 A290219 * A259611 A351299 A215624
KEYWORD
nonn
AUTHOR
Henry Bottomley, Jul 31 2000
EXTENSIONS
More terms from Harvey P. Dale, May 19 2012
STATUS
approved