A017055 - OEIS

A017055

a(n) = (7*n + 6)^3.

216, 2197, 8000, 19683, 39304, 68921, 110592, 166375, 238328, 328509, 438976, 571787, 729000, 912673, 1124864, 1367631, 1643032, 1953125, 2299968, 2685619, 3112136, 3581577, 4096000, 4657463, 5268024

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OFFSET

0,1

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).

FORMULA

G.f.: ( 216 + 1333*x + 508*x^2 + x^3 ) / (x-1)^4. - R. J. Mathar, Aug 01 2014

MATHEMATICA

(7*Range[0, 30]+6)^3 (* or *) LinearRecurrence[{4, -6, 4, -1}, {216, 2197, 8000, 19683}, 30] (* Harvey P. Dale, Mar 06 2019 *)

PROG

(Magma) [(7*n+6)^3: n in [0..40]]; // Vincenzo Librandi, Jul 10 2011

CROSSREFS

Cf. A017053 (7*n+6).

Sequence in context: A222694 A243862 A223559 * A299859 A017139 A249005

Adjacent sequences: A017052 A017053 A017054 * A017056 A017057 A017058

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved