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A155977 a(n) = n^5 + n^3. 6
0, 2, 40, 270, 1088, 3250, 7992, 17150, 33280, 59778, 101000, 162382, 250560, 373490, 540568, 762750, 1052672, 1424770, 1895400, 2482958, 3208000, 4093362, 5164280, 6448510, 7976448, 9781250, 11898952, 14368590, 17232320, 20535538 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Sequence occurs in the binomial identity Sum_{k = 0..n} a(k)* binomial(n,k)/binomial(n+k,k) = n^3. - Peter Bala, Feb 12 2019

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..10000

Index entries for linear recurrences with constant coefficients, signature (6,-15,20,-15,6,-1).

FORMULA

a(n) = 2*A168178(n).

a(n) = A000578(n)*A002522(n). - Vincenzo Librandi, Feb 03 2012

G.f.: 2*x*(1 + 14*x + 30*x^2 + 14*x^3 + x^4)/(1-x)^6. - Vincenzo Librandi, Feb 05 2013

E.g.f.: x*(2 + 18*x + 26*x^2 + 10*x^3 + x^4)*exp(x). - G. C. Greubel, Sep 02 2019

MAPLE

seq(n^5 + n^3, n=0..30); # G. C. Greubel, Sep 02 2019

MATHEMATICA

Table[n^5 + n^3, {n, 0, 30}] (* Vladimir Joseph Stephan Orlovsky, Apr 18 2011 *)

CoefficientList[Series[2x(1+14x+30x^2+14x^3+x^4)/(1-x)^6, {x, 0, 30}], x] (* Vincenzo Librandi, Feb 05 2013 *)

LinearRecurrence[{6, -15, 20, -15, 6, -1}, {0, 2, 40, 270, 1088, 3250}, 30] (* Harvey P. Dale, Jan 18 2015 *)

PROG

(PARI) a(n)=n^5+n^3 \\ Charles R Greathouse IV, Dec 28 2011

(Magma) [n^5 + n^3: n in [0..30]] // Vincenzo Librandi, Feb 03 2012

(Sage) [n^5 + n^3 for n in (0..30)] # G. C. Greubel, Sep 02 2019

(GAP) List([0..30], n-> n^5 + n^3); # G. C. Greubel, Sep 02 2019

CROSSREFS

Cf. A000578, A002522, A168178.

Sequence in context: A012477 A003760 A228240 * A092698 A181175 A035604

Adjacent sequences: A155974 A155975 A155976 * A155978 A155979 A155980

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 01 2009

STATUS

approved

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Last modified November 30 02:32 EST 2022. Contains 358431 sequences. (Running on oeis4.)