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A127605 a[n]=2^(2*n*n)*product(product(sin(i*Pi/(2*n+1))^2+ sin(j*Pi/(2*n+1))^2,j=1..n),i=1..n). 5
1, 6, 500, 463736, 4614756624, 485005220494432, 533978739649683515200, 6129678550595328659594928000, 731483813983605533022316212534132992, 905665520470954445892575061753881157482726912 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

MAPLE

for n from 0 to 12 do a[n]:=2^(2*n*n)*product(product(sin(i*Pi/(2*n+1))^2+ sin(j*Pi/(2*n+1))^2, j=1..n), i=1..n) od: seq(round(evalf(a[n], 300)), n=0..12);

CROSSREFS

Cf. A004003.

Sequence in context: A197803 A099057 A123278 * A013975 A103520 A003395

Adjacent sequences:  A127602 A127603 A127604 * A127606 A127607 A127608

KEYWORD

nonn

AUTHOR

Miklos Kristof (kristmikl(AT)freemail.hu), Apr 03 2007

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Last modified February 15 13:31 EST 2012. Contains 205802 sequences.