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A050187
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T(n,2), array T as in A050186; a count of aperiodic binary words.
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2
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0, 3, 4, 10, 12, 21, 24, 36, 40, 55, 60, 78, 84, 105, 112, 136, 144, 171, 180, 210, 220, 253, 264, 300, 312, 351, 364, 406, 420, 465, 480, 528, 544, 595, 612, 666, 684, 741, 760, 820, 840, 903, 924, 990, 1012, 1081, 1104, 1176
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,2
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COMMENTS
| The Row2 triangle sums A159797 lead to the sequence given above for n>=1 with a(1)=0. For the definitions of the Row2 and other triangle sums see A180662. [From Johannes W. Meijer, May 20 2011]
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FORMULA
| a(n) = n*floor((n-1)/2).
a(n)=a(n-1)+2*a(n-2)-2*a(n-3)-a(n-4)+a(n-5). G.f.: x^3*(3+x)/((1+x)^2*(1-x)^3). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 08 2009]
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CROSSREFS
| Sequence in context: A131179 A079353 A135116 * A101506 A092434 A031367
Adjacent sequences: A050184 A050185 A050186 * A050188 A050189 A050190
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KEYWORD
| nonn
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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