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A052481
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2^n*(binomial(n,2)+1).
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1
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1, 2, 8, 32, 112, 352, 1024, 2816, 7424, 18944, 47104, 114688, 274432, 647168, 1507328, 3473408, 7929856, 17956864, 40370176, 90177536, 200278016, 442499072, 973078528, 2130706432, 4647288832, 10099884032, 21877489664, 47244640256
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (6,-12,8).
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FORMULA
| For the sequence 1, 1, 1, 2, 8, 32, ... we have a(n)=2^n(n^2-5n+8)/8 - Paul Barry (pbarry(AT)wit.ie), Jun 26 2003
a(n)= +6*a(n-1) -12*a(n-2) +8*a(n-3). G.f.: -(1-4*x+8*x^2)/(2*x-1)^3. - R. J. Mathar, Jan 04 2011
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CROSSREFS
| Sequence in context: A026369 A006552 A134753 * A067897 A145682 A099752
Adjacent sequences: A052478 A052479 A052480 * A052482 A052483 A052484
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mar 16 2000
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