42430domain: NAppears in sequencesNumber of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal.at n=13A209346Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+5x+5y>0.at n=22A211627a(n) = Sum_{k=1..n} k * sigma_3(k).at n=10A356126