This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A026337 a(n) = 4^n*(4^n - 1)/2. 3
 0, 6, 120, 2016, 32640, 523776, 8386560, 134209536, 2147450880, 34359607296, 549755289600, 8796090925056, 140737479966720, 2251799780130816, 36028796884746240, 576460751766552576, 9223372034707292160, 147573952581086478336, 2361183241400462868480 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 Index entries for linear recurrences with constant coefficients, signature (20,-64). FORMULA a(n) = binomial(4^n, 2), n >= 0. - Zerinvary Lajos, Jan 07 2008 From R. J. Mathar, Mar 20 2009: (Start) a(n) = 20*a(n-1) - 64*a(n-2). G.f.: 6*x/((16*x-1)*(4*x-1)). (End) a(n) = 6*A166984(n-1). - R. J. Mathar, Jun 23 2013 MAPLE seq(binomial(4^n, 2), n=0..18); # Zerinvary Lajos, Jan 07 2008 PROG (MAGMA) [4^n*(4^n-1)/2: n in [0..30]]; // Vincenzo Librandi, May 01 2011 CROSSREFS Sequence in context: A115678 A048604 A001516 * A223629 A065888 A246191 Adjacent sequences:  A026334 A026335 A026336 * A026338 A026339 A026340 KEYWORD nonn AUTHOR STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 22 19:53 EDT 2019. Contains 328319 sequences. (Running on oeis4.)