314367domain: NAppears in sequencesExpansion of (1+2*x+4*x^2)/(1-x-8*x^4).at n=18A098581Sum of binomial(Y(2,p), 2) over the partitions p of n, where Y(2,p) is the number of part sizes with multiplicity 2 or greater in p.at n=42A304825