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1, 3, 12, 45, 180, 708, 2832, 11283, 45132, 180348, 721392, 2884860, 11539440, 46154928, 184619712, 738467565, 2953870260, 11815435908, 47261743632, 189046794180, 756187176720, 3024747985488, 12098991941952, 48395964882948
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(2n+1) = 4*a(2n); a(2n) = 4*a(2n-1)-a(n). - David Wasserman (dwasserm(AT)earthlink.net), May 22 2007
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CROSSREFS
| Sequence in context: A114515 A192467 A151162 * A026559 A188949 A184699
Adjacent sequences: A094544 A094545 A094546 * A094548 A094549 A094550
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jun 06 2004
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EXTENSIONS
| More terms from David Wasserman (dwasserm(AT)earthlink.net), May 22 2007
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