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 A167423 Hankel transform of a simple Catalan convolution. 2
 1, -1, -11, -50, -186, -631, -2029, -6299, -19075, -56704, -166164, -481391, -1381691, -3935125, -11134331, -31328366, -87721614, -244588519, -679429225, -1881102959, -5192705779, -14296088956, -39263958696, -107601905375, -294291714551, -803416991401 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Hankel transform of A167422. LINKS G. C. Greubel, Table of n, a(n) for n = 0..500 Index entries for linear recurrences with constant coefficients, signature (6,-11,6,-1). FORMULA G.f.: ( 1-7*x+6*x^2-x^3 ) / (x^2-3*x+1)^2 . a(n) = F(2*n)*(1-3*n)/2 + L(2*n)*(1-n)/2. - Paul Barry, Feb 22 2010 a(n) = 3*A001871(n-1) - 2*A001871(n) + F(2*n+4). - Ralf Stephan, May 21 2014 a(n) = 1 - Sum_{k=1..n} k*F(2*k+1), where F(n) = A000045(n). - Vladimir Reshetnikov, Oct 28 2015 MATHEMATICA Table[((1-3n) Fibonacci[2n] + (1-n) LucasL[2n])/2, {n, 0, 20}] (* Vladimir Reshetnikov, Oct 28 2015 *) LinearRecurrence[{6, -11, 6, -1}, {1, -1, -11, -50}, 50] (* G. C. Greubel, Jun 12 2016 *) PROG (PARI) Vec((1-7*x+6*x^2-x^3)/(1-6*x+11*x^2-6*x^3+x^4) + O(x^100)) \\ Altug Alkan, Oct 29 2015 (MAGMA) [Fibonacci(2*n)*(1-3*n)/2 + Lucas(2*n)*(1-n)/2: n in [0..30]]; // Vincenzo Librandi, Jun 13 2016 CROSSREFS Cf. A167422, A000045, A000032. Sequence in context: A185019 A212560 A211920 * A026618 A266034 A026684 Adjacent sequences:  A167420 A167421 A167422 * A167424 A167425 A167426 KEYWORD easy,sign AUTHOR Paul Barry, Nov 03 2009 STATUS approved

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Last modified August 15 10:51 EDT 2020. Contains 336492 sequences. (Running on oeis4.)