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A087206
a(n)=2a(n-1)+4a(n-2),a(0)=1,a(1)=4.
+0
5
1, 4, 12, 40, 128, 416, 1344, 4352, 14080, 45568, 147456, 477184, 1544192, 4997120, 16171008, 52330496, 169345024, 548012032, 1773404160, 5738856448, 18571329536, 60098084864, 194481487872, 629355315200, 2036636581888
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Maintained by
N. J. A. Sloane
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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.
AT&T Labs Research
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