410425domain: NAppears in sequencesExpansion of (2-x-2*x^2-x^3)/(1-x-x^2)^2.at n=23A102702Number of set partitions of [n] such that for each block b the smallest integer interval containing b has at most five elements and for at least one block c the smallest integer interval containing c has exactly five elements.at n=9A320555