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 A144843 a(n) = (6^n - 2^n)^2 / 16. 1
 1, 64, 2704, 102400, 3748096, 135675904, 4893282304, 176265625600, 6346852335616, 228502162898944, 8226263614357504, 296147719133593600, 10661344637077159936, 383808727914259677184, 13817118056668205154304, 497416296261117961830400, 17906987220053014721069056 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Index entries for linear recurrences with constant coefficients, signature (52,-624,1728). FORMULA From R. J. Mathar, Sep 24 2008: (Start) a(n) = 81*36^(n-2) + 4^(n-2) - 18*12^(n-2). G.f.: x*(1+12x)/((1-36x)*(1-4x)*(1-12x)). (End) a(n) = A016129(n-1)^2. - Philippe Deléham, Nov 26 2008 MATHEMATICA Table[(6^n-2^n)^2/16, {n, 20}] (* or *) Table[4^(n-2) (3^n-1)^2, {n, 20}] (* Harvey P. Dale, Apr 15 2020 *) CROSSREFS Sequence in context: A269291 A203256 A265632 * A284228 A017319 A036531 Adjacent sequences:  A144840 A144841 A144842 * A144844 A144845 A144846 KEYWORD nonn,easy AUTHOR Al Hakanson (hawkuu(AT)gmail.com), Sep 22 2008 EXTENSIONS More terms from R. J. Mathar, Sep 24 2008 STATUS approved

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Last modified May 19 05:04 EDT 2022. Contains 353826 sequences. (Running on oeis4.)