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A051958
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a(n) = 2 a(n-1) + 24 a(n-2), a(0)=0, a(1)=1.
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5
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0, 1, 2, 28, 104, 880, 4256, 29632, 161408, 1033984, 5941760, 36699136, 216000512, 1312780288, 7809572864, 47125872640, 281681494016, 1694383931392, 10149123719168, 60963461791744, 365505892843520, 2194134868688896
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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FORMULA
| G.f.: x/((1+4*x)*(1-6*x)). a(n)=(6^n-(-4)^n)/10
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MATHEMATICA
| Join[{a=0, b=1}, Table[c=2*b+24*a; a=b; b=c, {n, 60}]] (*From Vladimir Joseph Stephan Orlovsky, Feb 01 2011*)
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PROG
| (PARI) a(n)=(6^n-(-4)^n)/10
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CROSSREFS
| a(n)=2^(n-1)*A015441(n).
Cf. A015441.
Sequence in context: A156471 A138964 A200040 * A123807 A164834 A174707
Adjacent sequences: A051955 A051956 A051957 * A051959 A051960 A051961
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KEYWORD
| easy,nonn
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AUTHOR
| Barry E. Williams, Jan 04 2000
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EXTENSIONS
| More terms from Michael Somos, Apr 28, 2000.
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