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 A103333 Number of closed walks on the graph of the (7,4) Hamming code. 11
 1, 3, 24, 192, 1536, 12288, 98304, 786432, 6291456, 50331648, 402653184, 3221225472, 25769803776, 206158430208, 1649267441664, 13194139533312, 105553116266496, 844424930131968, 6755399441055744, 54043195528445952, 432345564227567616 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Counts closed walks of length 2n at the degree 3 node of the graph of the (7,4) Hamming code. With interpolated zeros, counts paths of length n at this node. a(n+1) = A157176(A016945(n)). - Reinhard Zumkeller, Feb 24 2009 For n>0: a(n) = A083713(n) - A083713(n-1). - Reinhard Zumkeller, Feb 22 2010 REFERENCES David J.C. Mackay, Information Theory, Inference and Learning Algorithms, CUP, 2003, p. 19 LINKS Nathaniel Johnston, Table of n, a(n) for n = 0..500 Index entries for linear recurrences with constant coefficients, signature (8). FORMULA G.f.: (1-5*x)/(1-8*x); a(n) = (3*8^n + 5*0^n)/8. a(n) = 8*a(n-1) for n > 0. - Harvey P. Dale, Mar 02 2012 MAPLE seq((3*8^n+5*`if`(n=0, 1, 0))/8, n=0..20); # Nathaniel Johnston, Jun 26 2011 MATHEMATICA Join[{1}, NestList[8#&, 3, 20]] (* Harvey P. Dale, Mar 02 2012 *) CROSSREFS Cf. A082412, A103334. Cf. A000302, A004171. - Vincenzo Librandi, Jan 22 2009 Sequence in context: A122741 A136325 A194888 * A037762 A037650 A037769 Adjacent sequences:  A103330 A103331 A103332 * A103334 A103335 A103336 KEYWORD easy,nonn AUTHOR Paul Barry, Jan 31 2005 STATUS approved

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Last modified December 8 14:38 EST 2019. Contains 329865 sequences. (Running on oeis4.)