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A005618
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a(n) = 6*a(n-1) - 8.
(Formerly M3528)
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4
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4, 16, 88, 520, 3112, 18664, 111976, 671848, 4031080, 24186472, 145118824, 870712936, 5224277608, 31345665640, 188073993832, 1128443962984, 6770663777896, 40623982667368, 243743896004200, 1462463376025192
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Table of n, a(n) for n=0..19.
J. T. Butler, Tandem networks of universal cells, IEEE Trans. Computers, C-27 (1978), 785-799. (Annotated scanned copy)
K. K. Maitra, Cascaded switching networks of two-input flexible cells, IEEE Trans. Electron. Computers, C-11 (1962), 136-143.
Simon Plouffe, Approximations de séries génératrices et quelques conjectures, Dissertation, Université du Québec à Montréal, 1992.
Simon Plouffe, 1031 Generating Functions, Appendix to Thesis, Montreal, 1992
Index entries for linear recurrences with constant coefficients, signature (7,-6).
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FORMULA
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a(n) = (4/5)*(2 + 3*6^n), with n >= 0. - Paolo P. Lava, Jun 25 2008
G.f.: ( 4-12*x ) / ( (6*x-1)*(x-1) ). - Simon Plouffe in his 1992 dissertation
For n > 0, a(n) = N(n,2,2) where N(n,s,r) is defined in A005608. - Sean A. Irvine, Jul 13 2016
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MATHEMATICA
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NestList[6#-8&, 4, 20] (* Harvey P. Dale, Mar 29 2018 *)
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CROSSREFS
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Cf. A005608, A005609.
Sequence in context: A165964 A300279 A321238 * A005495 A052124 A235166
Adjacent sequences: A005615 A005616 A005617 * A005619 A005620 A005621
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KEYWORD
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nonn,easy,changed
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AUTHOR
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N. J. A. Sloane
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EXTENSIONS
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More terms from Jon E. Schoenfield, Mar 27 2010
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STATUS
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approved
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