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A167573
The third row of the ED3 array A167572.
3
23, 83, 183, 323, 503, 723, 983, 1283, 1623, 2003, 2423, 2883, 3383, 3923, 4503, 5123, 5783, 6483, 7223, 8003, 8823, 9683, 10583, 11523, 12503, 13523, 14583, 15683, 16823, 18003, 19223, 20483, 21783, 23123, 24503, 25923, 27383, 28883, 30423
OFFSET
1,1
FORMULA
a(n) = 20*n^2 + 3.
G.f.: (3*z^2 + 14*z + 23)/(1-z)^3.
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3). - G. C. Greubel, Jun 16 2016
MATHEMATICA
Table[20*n^2 + 3, {n, 1, 100] (* or *) LinearRecurrence[{3, -3, 1}, {23, 83, 183}, 100] (* G. C. Greubel, Jun 16 2016 *)
PROG
(PARI) a(n)=20*n^2+3 \\ Charles R Greathouse IV, Jun 17 2017
CROSSREFS
Equals the third row of the ED3 array A167572.
Sequence in context: A256376 A128825 A339475 * A318356 A142790 A288340
KEYWORD
easy,nonn
AUTHOR
Johannes W. Meijer, Nov 10 2009
STATUS
approved