0,3
Table of n, a(n) for n=0..71.
E. Angelini, k-chunks sum and division by k, post to the SeqFan list, Mar 22 2013
a(n) = 2 a(n-3) - a(n-6).
G.f.: x*(1 + 2*x + 3*x^2 + 2*x^3 + 4*x^4)/((1-x)*(1+x+x^2))^2.
Cf. A222257-A222261.
Sequence in context: A123494 A123716 A229927 * A223540 A300868 A176077
Adjacent sequences: A222253 A222254 A222255 * A222257 A222258 A222259
nonn
Eric Angelini and M. F. Hasler, Mar 23 2013
approved