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 A212335 Expansion of 1/(1-22*x+22*x^2-x^3). 2
 1, 22, 462, 9681, 202840, 4249960, 89046321, 1865722782, 39091132102, 819048051361, 17160917946480, 359560228824720, 7533603887372641, 157846121406000742, 3307234945638642942, 69294087737005501041, 1451868607531476878920 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Partial sums of A092499 (after 0). LINKS Bruno Berselli, Table of n, a(n) for n = 0..200 Index entries for linear recurrences with constant coefficients, signature (22,-22,1). FORMULA G.f.: 1/((1-x)*(1-21*x+x^2)). a(n) = (((230-11*sqrt(437))*(21-sqrt(437))^n+(230+11*sqrt(437))*(21+sqrt(437))^n)/2^n-23)/437. a(n) = a(-n-3) = 23*a(n-1)-23*a(n-2)+a(n-3). a(n)*a(n+2) = a(n+1)*(a(n+1)-1). MAPLE a:= n-> (<<0|1|0>, <0|0|1>, <1|-22|22>>^n. <<1, 22, 462>>)[1, 1]: seq(a(n), n=0..20); # Alois P. Heinz, Jun 15 2012 MATHEMATICA CoefficientList[Series[1/(1 - 22 x + 22 x^2 - x^3), {x, 0, 16}], x] LinearRecurrence[{22, -22, 1}, {1, 22, 462}, 20] (* Harvey P. Dale, Nov 04 2017 *) PROG (PARI) Vec(1/(1-22*x+22*x^2-x^3)+O(x^17)) (Maxima) makelist(coeff(taylor(1/(1-22*x+22*x^2-x^3), x, 0, n), x, n), n, 0, 16); (Magma) m:=17; R:=PowerSeriesRing(Integers(), m); Coefficients(R!(1/(1-22*x+22*x^2-x^3))); CROSSREFS Cf. A212336 for more sequences with g.f. of the type 1/(1-k*x+k*x^2-x^3). Sequence in context: A269681 A269470 A162808 * A342887 A163149 A163514 Adjacent sequences: A212332 A212333 A212334 * A212336 A212337 A212338 KEYWORD nonn,easy AUTHOR Bruno Berselli, Jun 12 2012 STATUS approved

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Last modified April 25 10:01 EDT 2024. Contains 371967 sequences. (Running on oeis4.)