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1, 6, 24, 84, 276, 876, 2724, 8364, 25476, 77196, 233124, 702444, 2113476, 6352716, 19082724, 57297324, 171990276, 516167436, 1548895524, 4647473004, 13943991876, 41835121356, 125511655524, 376547549484, 1129667814276
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Second binomial transform of A123932 = [1,4,4,4,4,4,4,4,...].
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (5,-6).
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FORMULA
| a(0)= 1, a(1)= 6, a(n)= 5*a(n-1)-6*a(n-2) for n>1. G.f.: (1+x)/(1-5x+6x^2).
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PROG
| (PARI) a(n)=4*3^n-3<<n \\ Charles R Greathouse IV, Jan 12 2012
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CROSSREFS
| Sequence in context: A133474 A052150 A118043 * A124807 A121532 A025472
Adjacent sequences: A166057 A166058 A166059 * A166061 A166062 A166063
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KEYWORD
| nonn,easy
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AUTHOR
| Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 05 2009
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EXTENSIONS
| a(19) and a(22) corrected by Charles R Greathouse IV, Jan 12 2012
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