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Search: id:A115243
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| A115243 |
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a(n)=((1/15)*(-5 + 3*(-1)^n + 2^(1 + 2*n) + (-10 - 6*(-1)^n + 4^n)*UnitStep[ -1 + n])*2^(2*n))/4^n |
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+0
2
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| 0, 2, 12, 50, 204, 818, 3276, 13106, 52428, 209714, 838860, 3355442, 13421772, 53687090, 214748364, 858993458, 3435973836, 13743895346, 54975581388, 219902325554, 879609302220, 3518437208882, 14073748835532, 56294995342130
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Inverse z transform of Polynomial in A112627
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FORMULA
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a(n) = InverseZTransform[(1 + 2*x)/(1 - x - 16*x^2 + 16*x^3), x, n]*2^(2*n)
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MATHEMATICA
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a== Table[InverseZTransform[(1 + 2*x)/(1 - x - 16*x^2 + 16*x^3), x, n]*2^( 2*n), {n, 1, 25}]
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CROSSREFS
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Cf. A112627.
Adjacent sequences: A115240 A115241 A115242 this_sequence A115244 A115245 A115246
Sequence in context: A028243 A003493 A129743 this_sequence A012423 A012427 A012695
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KEYWORD
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nonn
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Mar 04 2006
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