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A005618
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a(n)=6*a(n-1) - 8.
(Formerly M3528)
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1
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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; internal format)
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OFFSET
| 0,1
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REFERENCES
| J. T. Butler, Tandem networks of universal cells, IEEE Trans. Computers, C-27 (1978), 681-690.
K. K. Maitra, Cascaded switching networks of two-input flexible cells, IEEE Trans. Electron. Computers, C-11 (1962), 136-143.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| S. Plouffe, Approximations de S\'{e}ries G\'{e}n\'{e}ratrices et Quelques Conjectures, Dissertation, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.
S. Plouffe, 1031 Generating Functions and Conjectures, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.
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FORMULA
| a(n)=(4/5)*(2+3*6^n), with n>=0. - Paolo P. Lava (paoloplava(AT)gmail.com), Jun 25 2008
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MAPLE
| A005618:=-4*(-1+3*z)/(6*z-1)/(z-1); [Conjectured by S. Plouffe in his 1992 dissertation.]
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CROSSREFS
| Sequence in context: A006681 A074876 A165964 * A005495 A052124 A013030
Adjacent sequences: A005615 A005616 A005617 * A005619 A005620 A005621
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Mar 27 2010
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