This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A037639 Base 4 digits are, in order, the first n terms of the periodic sequence with initial period 2,3,1. 1
 2, 11, 45, 182, 731, 2925, 11702, 46811, 187245, 748982, 2995931, 11983725, 47934902, 191739611, 766958445, 3067833782, 12271335131, 49085340525, 196341362102, 785365448411, 3141461793645, 12565847174582, 50263388698331 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 Index to sequences with linear recurrences with constant coefficients, signature (4,0,1,-4). FORMULA G.f. x*(x+2)*(1+x) / ( (x-1)*(4*x-1)*(1+x+x^2) ). - R. J. Mathar, Nov 21 2011 a(n) = 4*a(n-1) + a(n-3) - 4*a(n-4). Vincenzo Librandi, Jun 17 2012 MATHEMATICA LinearRecurrence[{4, 0, 1, -4}, {2, 11, 45, 182}, 40] (* Vincenzo Librandi, Jun 17 2012 *) PROG (MAGMA) I:=[2, 11, 45, 182]; [n le 4 select I[n] else 4*Self(n-1)+Self(n-3)-4*Self(n-4): n in [1..30]]; // Vincenzo Librandi, Jun 17 2012 CROSSREFS Sequence in context: A209604 A120279 A037751 * A000176 A042927 A140305 Adjacent sequences:  A037636 A037637 A037638 * A037640 A037641 A037642 KEYWORD nonn,base AUTHOR STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .