OFFSET
0,1
COMMENTS
Numbers of the 10th column of positive numbers in the square array of nonnegative and polygonal numbers A139600.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..5000
Index entries for linear recurrences with constant coefficients, signature (2,-1).
FORMULA
a(n) = A057145(n+2,10).
G.f.: 5*(2+7*x)/(x-1)^2. - R. J. Mathar, Jul 28 2016
From Elmo R. Oliveira, Apr 16 2024: (Start)
E.g.f.: 5*exp(x)*(2 + 9*x).
a(n) = 2*a(n-1) - a(n-2) for n >= 2. (End)
MATHEMATICA
45*Range[0, 50]+10 (* or *) LinearRecurrence[{2, -1}, {10, 55}, 50] (* Harvey P. Dale, Dec 27 2021 *)
PROG
(Magma) [5*(9*n + 2): n in [0..60]]; // Vincenzo Librandi, Jul 23 2011
(PARI) a(n)=45*n+10 \\ Charles R Greathouse IV, Oct 05 2011
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Apr 27 2008
STATUS
approved