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A016983
a(n) = (7*n)^3.
2
0, 343, 2744, 9261, 21952, 42875, 74088, 117649, 175616, 250047, 343000, 456533, 592704, 753571, 941192, 1157625, 1404928, 1685159, 2000376, 2352637, 2744000, 3176523, 3652264, 4173281, 4741632, 5359375, 6028568, 6751269, 7529536, 8365427, 9261000, 10218313
OFFSET
0,2
FORMULA
G.f.: 343*x*(1 + 4*x + x^2)/(1 - x)^4. - Vincenzo Librandi, Jul 05 2014
a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4) for n > 3. - Vincenzo Librandi, Jul 05 2014
MATHEMATICA
Table[343 n^3, {n, 0, 40}] (* or *) CoefficientList[Series[343 x (1 + 4 x + x^2)/(1 - x)^4, {x, 0, 40}], x] (* Vincenzo Librandi, Jul 05 2014 *)
PROG
(Magma) [(7*n)^3: n in [0..40]]; // Vincenzo Librandi, May 22 2011
CROSSREFS
Cf. similar sequences listed in A244725.
Sequence in context: A167730 A250138 A016923 * A267321 A134738 A017151
KEYWORD
nonn,easy
AUTHOR
STATUS
approved