115011domain: NAppears in sequencesNumber of set partitions of [n] into exactly six blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.at n=9A274870Expansion of (1/x) * Series_Reversion( x * (1-3*x)^2 / (1+2*x)^3 ).at n=4A386773