OFFSET
0,2
COMMENTS
Essentially identical to A026817. - R. J. Mathar, May 28 2008
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..5000
Index entries for linear recurrences with constant coefficients, signature (3,-3,1).
FORMULA
a(n) = A110449(n, 5) for n>4.
a(n) = 11*n + a(n-1) - 5 with n>0, a(0)=0. - Vincenzo Librandi, Aug 04 2010
G.f.: x*(6 + 5*x)/(1 - x)^3. - Philippe Deléham, Mar 27 2013
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) with n>2, a(0)=0, a(1)=6, a(2)=23. - Philippe Deléham, Mar 27 2013
a(n) = A218530(11*n+5).
E.g.f.: (x/2)*(11*x + 12)*exp(x). - G. C. Greubel, Aug 24 2017
MATHEMATICA
Table[n*(11*n + 1)/2, {n, 0, 50}] (* G. C. Greubel, Aug 24 2017 *)
PROG
(PARI) a(n)=n*(11*n+1)/2 \\ Charles R Greathouse IV, Jun 17 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved