OFFSET
0,2
COMMENTS
a(n) = Sum_{k <= n} A071053(k)
LINKS
N. J. A. Sloane, Table of n, a(n) for n = 0..16383
S. R. Finch, P. Sebah and Z.-Q. Bai, Odd Entries in Pascal's Trinomial Triangle (arXiv:0802.2654)
N. J. A. Sloane, On the Number of ON Cells in Cellular Automata, arXiv:1503.01168, 2015
MATHEMATICA
Sum[PolynomialMod[(1+x+x^2)^k, 2] /. x->1, {k, 0, n-1}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Steven Finch, Jan 25 2008
EXTENSIONS
Offset changed to 0 by N. J. A. Sloane, Feb 06 2015
STATUS
approved