OFFSET
8,1
COMMENTS
Equals binomial transform of [6, 9, 1, 0, 0, 0, ...]. - Gary W. Adamson, Aug 25 2009
LINKS
FORMULA
a(n) = A000217(n)-30, n>7.
a(n) = n + a(n-1) with n>8, a(8)=6. - Vincenzo Librandi, Aug 06 2010
G.f.: x^8*(6-3*x-2*x^2)/(1-x)^3. - Colin Barker, Mar 19 2012
MATHEMATICA
Table[n*(n + 1)/2 - 30, {n, 8, 70}] (* Stefan Steinerberger, Mar 31 2006 *)
Select[Accumulate[Range[60]]-30, #>0&] (* Harvey P. Dale, Apr 13 2011 *)
PROG
(PARI) a(n)=n*(n+1)/2-30 \\ Charles R Greathouse IV, Nov 10 2015
CROSSREFS
KEYWORD
nonn,easy,nice
AUTHOR
Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 21 1999
STATUS
approved