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A152729 a(n) = (n-2)^4 - a(n-1) - a(n-2), with a(1) = a(2) = 0. 5
0, 0, 1, 15, 65, 176, 384, 736, 1281, 2079, 3201, 4720, 6720, 9296, 12545, 16575, 21505, 27456, 34560, 42960, 52801, 64239, 77441, 92576, 109824, 129376, 151425, 176175, 203841, 234640, 268800, 306560, 348161, 393855, 443905, 498576, 558144 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
COMMENTS
a(n+2) - a(n-1) = n^4 - (n-1)^4 = A005917(n) for all n in Z. - Michael Somos, Sep 02 2018
LINKS
FORMULA
G.f.: -x^3*(x+1)*(x^2+10*x+1) / ((x-1)^5*(x^2+x+1)). - Colin Barker, Oct 28 2014
a(n) = a(2 - n) for all n in Z. - Michael Somos, Sep 02 2018
EXAMPLE
0 + 0 + 1 = 1^4; 0 + 1 + 15 = 2^4; 1 + 15 + 65 = 3^4; ...
G.f. = x^3 + 15*x^4 + 65*x^5 + 176*x^6 + 384*x^7 + 736*x^8 + 1281*x^9 + ... - Michael Somos, Sep 02 2018
MATHEMATICA
k0=k1=0; lst={k0, k1}; Do[kt=k1; k1=n^4-k1-k0; k0=kt; AppendTo[lst, k1], {n, 1, 4!}]; lst
LinearRecurrence[{4, -6, 5, -5, 6, -4, 1}, {0, 0, 1, 15, 65, 176, 384}, 50] (* G. C. Greubel, Sep 01 2018 *)
a[ n_] := With[ {m = Max[n, 2 - n]}, SeriesCoefficient[ x^3 (1 + x) (1 + 10 x + x^2) / ((1 - x)^5 (1 + x + x^2)), {x , 0, m}]]; (* Michael Somos, Sep 02 2018 *)
PROG
(PARI) concat([0, 0], Vec(-x^3*(x+1)*(x^2+10*x+1)/((x-1)^5*(x^2+x+1)) + O(x^100))) \\ Colin Barker, Oct 28 2014
(PARI) {a(n) = my(m = max(n, 2 - n)); polcoeff( x^3 * (1 + x) * (1 + 10*x + x^2) / ((1 - x)^5 * (1 + x + x^2)) + x * O(x^m), m)}; /* Michael Somos, Sep 02 2018 */
(Magma) m:=50; R<x>:=PowerSeriesRing(Integers(), m); [0, 0] cat Coefficients(R!(x^3*(x+1)*(x^2+10*x+1)/((1-x)^5*(x^2+x+1)))); // G. C. Greubel, Sep 01 2018
CROSSREFS
Sequence in context: A005917 A218216 A027455 * A055268 A090026 A027526
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
Definition adapted to offset by Georg Fischer, Jun 18 2021
STATUS
approved

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Last modified February 27 21:03 EST 2024. Contains 370378 sequences. (Running on oeis4.)