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A049683
a(n)=(L(6n)-2)/16, where L=
A000032
(the Lucas sequence).
+0
2
0, 1, 20, 361, 6480, 116281, 2086580, 37442161, 671872320, 12056259601, 216340800500, 3882078149401, 69661065888720
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Maintained by
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Last modified December 17 13:29 EST 2009. Contains 170826 sequences.
AT&T Labs Research
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