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A060645
a(0) = 0, a(1) = 4 then a(n) = 18*a(n-1)-a(n-2).
+0
5
0, 4, 72, 1292, 23184, 416020, 7465176, 133957148, 2403763488, 43133785636, 774004377960, 13888945017644, 249227005939632, 4472197161895732, 80250321908183544, 1440033597185408060, 25840354427429161536
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Maintained by
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.
AT&T Labs Research
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