0,3
a(n)=(1/9)*{16*(n mod 6)+[(n+1) mod 6]-2*[(n+2) mod 6]-2*[(n+3) mod 6]+[(n+4) mod 6]+[(n+5) mod 6]}, with n>=0 - Paolo P. Lava (paoloplava(AT)gmail.com), Oct 02 2007
Cf. A131711.
Sequence in context: A019824 A019772 A046825 * A011279 A185094 A071099
Adjacent sequences: A131713 A131714 A131715 * A131717 A131718 A131719
nonn
Paul Curtz (bpcrtz(AT)free.fr), Sep 14 2007