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A082841
a(n)=4a(n-1)-a(n-2).
+0
6
3, 9, 33, 123, 459, 1713, 6393, 23859, 89043, 332313, 1240209, 4628523, 17273883, 64467009, 240594153, 897909603, 3351044259, 12506267433, 46674025473, 174189834459, 650085312363, 2426151414993, 9054520347609, 33791929975443
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Maintained by
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
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