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 A114619 a(n) = 2*A079291(n) (twice squares of Pell numbers). 2
 0, 2, 8, 50, 288, 1682, 9800, 57122, 332928, 1940450, 11309768, 65918162, 384199200, 2239277042, 13051463048, 76069501250, 443365544448, 2584123765442, 15061377048200, 87784138523762, 511643454094368 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (5,5,-1). FORMULA a(n) = 2*A000129(n)^2. G.f.: 2*x*(1-x)/((1+x)*(1-6*x+x^2)). a(n) = A001333(n)^2 - (-1)^n. - Antonio Pane (apane1(AT)spc.edu), Dec 15 2007 MATHEMATICA 2*Fibonacci[Range[0, 30], 2]^2 (* G. C. Greubel, Aug 18 2022 *) PROG (Magma) [n le 3 select 2*(n-1)^2 else 5*Self(n-1) +5*Self(n-2) -Self(n-3): n in [1..31]]; // G. C. Greubel, Aug 18 2022 (SageMath) [2*lucas_number1(n, 2, -1)^2 for n in (0..30)] # G. C. Greubel, Aug 18 2022 CROSSREFS Cf. A000129, A001109, A001333, A001542, A079291. Cf. also A090390, A108475, A114619, A116484. Sequence in context: A136226 A046165 A227264 * A027047 A034491 A360949 Adjacent sequences: A114616 A114617 A114618 * A114620 A114621 A114622 KEYWORD easy,nonn AUTHOR Creighton Dement, Feb 17 2006 EXTENSIONS Entry revised by N. J. A. Sloane, Mar 15 2024 STATUS approved

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Last modified April 12 22:48 EDT 2024. Contains 371639 sequences. (Running on oeis4.)