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Search: id:A144843
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| A144843 |
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((4+sqrt4)^n-(4-sqrt4)^n)^2/16 |
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+0
2
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| 1, 64, 2704, 102400, 3748096, 135675904, 4893282304, 176265625600, 6346852335616, 228502162898944, 8226263614357504, 296147719133593600, 10661344637077159936, 383808727914259677184, 13817118056668205154304
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OFFSET
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1,2
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FORMULA
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a(n)=81*36^(n-2)+4^(n-2)-18*12^(n-2). G.f.: x(1+12x)/((1-36x)(1-4x)(1-12x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2008]
a(n)=A016129(n-1)^2 . [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 26 2008]
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CROSSREFS
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Sequence in context: A053107 A000812 A004388 this_sequence A017319 A036531 A017439
Adjacent sequences: A144840 A144841 A144842 this_sequence A144844 A144845 A144846
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KEYWORD
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nonn
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AUTHOR
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Al Hakanson (hawkuu(AT)gmail.com), Sep 22 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2008
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