250490240domain: NAppears in sequencesa(n) = (3*n+5)!!!/5!!!.at n=7A051605Numerators in the expansion of the exponential generating function ((1 + 3*x)/x)*(1 - (1 + 3*x)^(-2/3)).at n=9A290597a(n) = Product_{k=0..n-1} (n+3*k+1).at n=7A384256