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 A156843 279841n^2 - 165048n + 24335. 4
 24335, 139128, 813603, 2047760, 3841599, 6195120, 9108323, 12581208, 16613775, 21206024, 26357955, 32069568, 38340863, 45171840, 52562499, 60512840, 69022863, 78092568, 87721955, 97911024, 108659775, 119968208, 131836323 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS The identity (279841*n^2-165048*n+24335)^2-(529*n^2-312*n+46)*(12167*n-3588)^2=1 can be written as a(n)^2-A156841(n)*A156846(n)^2=1 for n>0. LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..10000 Index to sequences with linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = 3*a(n-1) -3*a(n-2) +a(n-3). G.f.: (24335+66123*x+469224*x^2)/(1-x)^3. MATHEMATICA LinearRecurrence[{3, -3, 1}, {24335, 139128, 813603}, 40] PROG (MAGMA) I:=[24335, 139128, 813603]; [n le 3 select I[n] else 3*Self(n-1)-3*Self(n-2)+1*Self(n-3): n in [1..40]]; (PARI) a(n)= 279841*n^2-165048*n+24335 \\ Charles R Greathouse IV, Dec 23 2011 CROSSREFS Cf. A156841, A156846, A156849. Sequence in context: A140923 A208622 A025041 * A156844 A174754 A206682 Adjacent sequences:  A156840 A156841 A156842 * A156844 A156845 A156846 KEYWORD nonn,easy,changed AUTHOR Vincenzo Librandi, Feb 17 2009 EXTENSIONS Edited by Charles R Greathouse IV, Jul 25 2010 STATUS approved

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