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A006904
a(n) = a(n-1)+2.a(n-2)+(-1)^n.
(Formerly M3254)
+0
2
1, 1, 4, 5, 14, 23, 52, 97, 202, 395, 800, 1589, 3190, 6367, 12748, 25481, 50978, 101939, 203896, 407773, 815566, 1631111, 3262244, 6524465, 13048954, 26097883, 52195792, 104391557
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 16 13:01 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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