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 A003222 a(n) = 2^(3*n+1) - 2*n*(2*n+1). 1
 2, 10, 108, 982, 8120, 65426, 524132, 4194094, 33554160, 268435114, 2147483228, 17179868678, 137438952872, 1099511627074, 8796093021396, 70368744176734, 562949953420256, 4503599627369306, 36028797018962636 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 Index entries for linear recurrences with constant coefficients, signature (11,-27,25,-8). [From R. J. Mathar, May 05 2010] FORMULA From R. J. Mathar, May 05 2010: (Start) a(n) = 11*a(n-1) - 27*a(n-2) + 25*a(n-3) - 8*a(n-4). G.f.: 2*(1 - 6*x + 26*x^2 + 7*x^3)/ ( (8*x-1)* (x-1)^3). (End) PROG (MAGMA) [2^(3*n+1)-2*n*(2*n+1): n in [0..20]]; // Vincenzo Librandi, Jun 26 2011 (PARI) a(n) = 2^(3*n+1)-2*n*(2*n+1); \\ Altug Alkan, Sep 21 2018 CROSSREFS Equals A013730 - A002943. Sequence in context: A127728 A306064 A185396 * A262145 A003167 A240625 Adjacent sequences:  A003219 A003220 A003221 * A003223 A003224 A003225 KEYWORD nonn AUTHOR STATUS approved

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Last modified January 26 20:11 EST 2020. Contains 331288 sequences. (Running on oeis4.)