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Roland Bacher and Philippe Flajolet, <a href="http://arxiv.org/abs/0901.1379">Pseudo-factorials, elliptic functions, and continued fractions</a>, arXiv:0901.1379 [math.CA], 2009.
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(MAGMAMagma) [(9^n-8*n-1)/16: n in [0..25]]; // Vincenzo Librandi, Jun 29 2011
M. Abramowitz and I. A. Stegun, eds., <a href="http://appswww.nrbookconvertit.com/abramowitz_and_stegunGo/ConvertIt/Reference/indexAMS55.htmlASP">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
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LinearRecurrence[{11, -19, 9}, {0, 0, 4}, 21] (* Jean-François Alcover, Sep 21 2017 *)
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M. Abramowitz and I. A. Stegun, eds., <a href="http://wwwapps.nrbook.com/abramowitz_and_stegun/index.html">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
More terms from Paolo Dominici (pl.dm(AT)libero.it) using formulae formulas 16.22.1 and 16.22.2 of Abramowitz and Stegun's Handbook of Mathematical Functions.