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A244631
19*n^2.
5
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
OFFSET
0,2
COMMENTS
First bisection of A195048. - Bruno Berselli, Jul 03 2014
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: A159997 A073566 A098467 * A304513 A041698 A041700
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jul 03 2014
EXTENSIONS
G.f. corrected by Bruno Berselli, Jul 03 2014
STATUS
approved