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A048500
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2^(n-1)*(7*n-12)+7.
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1
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1, 2, 11, 43, 135, 375, 967, 2375, 5639, 13063, 29703, 66567, 147463, 323591, 704519, 1523719, 3276807, 7012359, 14942215, 31719431, 67108871, 141557767, 297795591, 624951303, 1308622855, 2734686215, 5704253447, 11878268935
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..1000
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FORMULA
| a(0)=1, a(1)=2, a(2)=11, a(n)=5*a(n-1)-8*a(n-2)+4*a(n-3). - Harvey P. Dale and Vincenzo Librandi, Sep 23 2011
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PROG
| (MAGMA) [2^(n-1)*(7*n-12)+7: n in [0..30]]; // Vincenzo Librandi, Sep 23 2011
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CROSSREFS
| a(n)=T(6, n), array T given by A048494.
Sequence in context: A027247 A128241 A141190 * A197189 A050620 A027253
Adjacent sequences: A048497 A048498 A048499 * A048501 A048502 A048503
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KEYWORD
| nonn,easy
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
| Formula from Ralf Stephan, Jan 15 2004
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