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A017294 a(n) = (10*n+2)^2. 1
4, 144, 484, 1024, 1764, 2704, 3844, 5184, 6724, 8464, 10404, 12544, 14884, 17424, 20164, 23104, 26244, 29584, 33124, 36864, 40804, 44944, 49284, 53824, 58564, 63504, 68644, 73984, 79524, 85264 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

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

a(n) = a(n-1)+200n-60, n>0 ; a(0)=4. - Miquel Cerda, Oct 30 2016

G.f.: 4*(1 + 33*x + 16*x^2)/(1 - x)^3. - Ilya Gutkovskiy, Oct 30 2016

a(n) = A017293(n)^2. - Michel Marcus, Oct 30 2016

a(n) = (2*A016861(n))^2. - David A. Corneth, Oct 30 2016

PROG

(MAGMA) [(10*n+2)^2: n in [0..35]]; // Vincenzo Librandi, Jul 30 2011

(PARI) a(n)=(10*n+2)^2 \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Cf. A016861, A017293.

Sequence in context: A058414 A053891 A053897 * A273698 A134631 A036511

Adjacent sequences:  A017291 A017292 A017293 * A017295 A017296 A017297

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 20 03:32 EST 2019. Contains 319323 sequences. (Running on oeis4.)