177564domain: NAppears in sequencesa(n) = Sum_{k=0..floor((n+1)/2)} (k+1) * A008315(n, k).at n=16A027305Number of permutations of [n] avoiding {1243, 1324, 2431}.at n=11A294822Row sums of A050158.at n=8A296770Expansion of (1/x) * Series_Reversion( x * (1 - x - x^3 / (1 - x)^3) ).at n=10A389404