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A017078 a(n) = (8*n + 1)^2. 1
1, 81, 289, 625, 1089, 1681, 2401, 3249, 4225, 5329, 6561, 7921, 9409, 11025, 12769, 14641, 16641, 18769, 21025, 23409, 25921, 28561, 31329, 34225, 37249, 40401, 43681, 47089, 50625, 54289, 58081 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

FORMULA

G.f.: ( -1 - 78*x - 49*x^2 ) / (x-1)^3. - R. J. Mathar, Mar 21 2016

PROG

(MAGMA) [(8*n+1)^2: n in [0..40]]; // Vincenzo Librandi, Jul 11 2011

(PARI) a(n)=(8*n+1)^2 \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Sequence in context: A236868 A237375 A237368 * A236055 A236048 A235954

Adjacent sequences:  A017075 A017076 A017077 * A017079 A017080 A017081

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified October 15 01:40 EDT 2019. Contains 328025 sequences. (Running on oeis4.)