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A002315
NSW numbers: a(n) = 6*a(n-1) - a(n-2); also a(n)^2 - 2*b(n)^2 = -1 with b(n)=
A001653
(n).
(Formerly M4423 N1869)
+0
74
1, 7, 41, 239, 1393, 8119, 47321, 275807, 1607521, 9369319, 54608393, 318281039, 1855077841, 10812186007, 63018038201, 367296043199, 2140758220993, 12477253282759, 72722761475561, 423859315570607, 2470433131948081
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Maintained by
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.
AT&T Labs Research
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