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 A083223 (5*6^n+(-6)^n)/6. 3
 1, 4, 36, 144, 1296, 5184, 46656, 186624, 1679616, 6718464, 60466176, 241864704, 2176782336, 8707129344, 78364164096, 313456656384, 2821109907456, 11284439629824, 101559956668416, 406239826673664, 3656158440062976 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..300 Index entries for linear recurrences with constant coefficients, signature (0,36). FORMULA a(n) = (5*6^n+(-6)^n)/6. G.f.: (1+4*x)/((1+6*x)*(1-6*x)). E.g.f. (5*exp(6*x)+exp(-6*x))/6. MATHEMATICA CoefficientList[Series[(1+4x)/((1+6x)(1-6x)), {x, 0, 50}], x]  (* Harvey P. Dale, Mar 01 2011 *) PROG (MAGMA) [(5*6^n+(-6)^n)/6: n in [0..25]]; // Vincenzo Librandi, Jun 29 2011 CROSSREFS Cf. A083222, A083224. Sequence in context: A035287 A183354 A204504 * A102263 A103931 A068589 Adjacent sequences:  A083220 A083221 A083222 * A083224 A083225 A083226 KEYWORD easy,nonn AUTHOR Paul Barry, Apr 23 2003 STATUS approved

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Last modified October 23 11:19 EDT 2019. Contains 328345 sequences. (Running on oeis4.)