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A048654
a(n)=2a(n-1)+a(n-2); a(0)=1, a(1)=4.
+0
22
1, 4, 9, 22, 53, 128, 309, 746, 1801, 4348, 10497, 25342, 61181, 147704, 356589, 860882, 2078353, 5017588, 12113529, 29244646, 70602821, 170450288, 411503397, 993457082, 2398417561, 5790292204
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Maintained by
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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.
AT&T Labs Research
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