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 A192374 Coefficient of x in the reduction of the polynomial p(n,x) defined at A162517 and below in Comments. 3
 0, 2, 4, 28, 84, 406, 1448, 6200, 23688, 97034, 380716, 1533844, 6079452, 24339742, 96844496, 386805104, 1541301648, 6150529682, 24521644756, 97819530508, 390080615652, 1555871900710, 6204937972088, 24747735482792, 98698893741336 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The polynomials p(n,x) is defined by ((x+d)^n-(x-d)^n)/(2d), where d=sqrt(x+4). A192374=2*A192375. For an introduction to reductions of polynomials by substitutions such as x^2->x+1, see A192232. LINKS Table of n, a(n) for n=1..25. FORMULA Empirical G.f.: 2*x^2/(9*x^4+6*x^3-10*x^2-2*x+1). [Colin Barker, Nov 23 2012] EXAMPLE (See A192373.) MATHEMATICA (See A192373.) CROSSREFS Cf. A192232, A192373, A192375. Sequence in context: A110881 A156449 A259375 * A274526 A264667 A356700 Adjacent sequences: A192371 A192372 A192373 * A192375 A192376 A192377 KEYWORD nonn AUTHOR Clark Kimberling, Jun 29 2011 STATUS approved

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Last modified October 2 02:58 EDT 2023. Contains 365831 sequences. (Running on oeis4.)