OFFSET
0,3
COMMENTS
A lower bound to Honaker's triangle problem A047837.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..10000
Index entries for linear recurrences with constant coefficients, signature (3,-3,1,0,0,0,0,1,-3,3,-1).
FORMULA
G.f.: x*(1 + 2*x^2 - x^3 + 3*x^4 - 2*x^5 + 3*x^6)/((1-x)^4*(1+x)*(1+x^2)*(1+x^4)). - R. J. Mathar, Mar 11 2012
MATHEMATICA
Table[Ceiling[n*(n+1)*(n+2)/8], {n, 0, 100}] (* Paolo Xausa, Aug 28 2024 *)
PROG
(Magma) [Ceiling( n*(n+1)*(n+2)/8 ) : n in [0..50]]; // Vincenzo Librandi, Sep 28 2011
(PARI) a(n)=(n*(n+1)*(n+2)+6)\8 \\ Charles R Greathouse IV, Oct 07 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved