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A244631 19*n^2. 4
0, 19, 76, 171, 304, 475, 684, 931, 1216, 1539, 1900, 2299, 2736, 3211, 3724, 4275, 4864, 5491, 6156, 6859, 7600, 8379, 9196, 10051, 10944, 11875, 12844, 13851, 14896, 15979, 17100, 18259, 19456, 20691, 21964, 23275, 24624, 26011, 27436, 28899, 30400 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

First bisection of A195048. - Bruno Berselli, Jul 03 2014

LINKS

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

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

FORMULA

G.f.: 19*x*(1 + x)/(1 - x)^3.

a(n) = 3*a(n-1) -3*a(n-2) +a(n-3) for n>2.

a(n) = 19*A000290(n). - Omar E. Pol, Jul 03 2014

MATHEMATICA

Table[19 n^2, {n, 0, 40}]

PROG

(MAGMA) [19*n^2: n in [0..40]];

(PARI) a(n)=19*n^2 \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Cf. A195048.

Cf. similar sequences listed in A244630.

Sequence in context: A290241 A159997 A073566 * A304513 A041698 A098467

Adjacent sequences:  A244628 A244629 A244630 * A244632 A244633 A244634

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Jul 03 2014

EXTENSIONS

G.f. corrected by Bruno Berselli, Jul 03 2014

STATUS

approved

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Last modified January 16 03:30 EST 2019. Contains 319184 sequences. (Running on oeis4.)