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Search: id:A072674
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| 0, 4, 14, 40, 110, 304, 854, 2440, 7070, 20704, 61094, 181240, 539630, 1610704, 4815734, 14414440, 43177790, 129402304, 387944774, 1163310040, 3488881550, 10464547504, 31389448214, 94159956040, 282463090910, 847355718304
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OFFSET
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0,2
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REFERENCES
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G. S. Carr, Formulas and Theorems in Pure Mathematics, New York, Chelsea, 1970. see pp. 83-84.
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FORMULA
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G.f.: x*(4-10*x)/((1-x)*(1-2*x)*(1-3*x)).
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PROGRAM
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(PARI) a(n)=3^n+2*2^n-3
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CROSSREFS
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Sequence in context: A023003 A001872 A054443 this_sequence A032285 A132357 A124616
Adjacent sequences: A072671 A072672 A072673 this_sequence A072675 A072676 A072677
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KEYWORD
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nonn,easy
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AUTHOR
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Michael Somos, Jul 01, 2002
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