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Search: id:A108366
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A108366 L(n,n), where L is defined as in A108299. +0
3
1, 0, 1, 13, 153, 2089, 33461, 620166, 13097377, 310957991, 8205571449, 238367471761, 7561422605881, 260127000028908, 9647591076297901, 383769576967012081, 16299953773597203585, 736281113282903567521 (list; graph; listen)
OFFSET

0,4

COMMENT

A108367 = L(n,-n).

FORMULA

a(n) = Prod(n - 2*cos((2*k-1)*Pi/(2*n+1)): 1<=k<=n) with Pi=3.14....

CROSSREFS

Cf. A000312.

Sequence in context: A163148 A051475 A097168 this_sequence A163415 A077416 A102146

Adjacent sequences: A108363 A108364 A108365 this_sequence A108367 A108368 A108369

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 01 2005

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.


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