A016974 - OEIS

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A016974

a(n) = (6*n + 5)^6.

15625, 1771561, 24137569, 148035889, 594823321, 1838265625, 4750104241, 10779215329, 22164361129, 42180533641, 75418890625, 128100283921, 208422380089, 326940373369, 496981290961, 735091890625, 1061520150601, 1500730351849, 2081951752609, 2839760855281, 3814697265625

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OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).

FORMULA

From Amiram Eldar, Apr 01 2022: (Start)

a(n) = A016969(n)^6 = A016970(n)^3 = A016971(n)^2.

Sum_{n>=0} 1/a(n) = PolyGamma(5, 5/6)/5598720. (End)

PROG

(Magma) [(6*n+5)^6: n in [0..25]]; // Vincenzo Librandi, May 10 2011