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1, 2, 6, 11, 23, 44, 85, 163, 311, 594, 1132, 2158, 4112, 7835, 14928, 28441, 54186, 103234, 196679, 374707, 713880, 1360061, 2591143, 4936559, 9404966, 17918024, 34136814, 65036304, 123904967, 236059552, 449732673, 856815474, 1632375854
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| G.f.: (1+x^2-x^3)/((1-x)*(1-x-2*x^2+x^4)). - Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 05 2005
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EXAMPLE
| 1=1, 1+1=2, 1+3+2=6; 1+5+4+1=11
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CROSSREFS
| Cf. A011973, A102426, A102427, A102428.
Sequence in context: A073939 A085264 A005999 * A080012 A103143 A005673
Adjacent sequences: A102426 A102427 A102428 * A102430 A102431 A102432
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KEYWORD
| easy,nonn
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AUTHOR
| Russell Walsmith (russw(AT)lycos.com), Jan 11 2005
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 05 2005
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