23049domain: NAppears in sequencesa(n) = (n+2)*(n+1)*(n^2 + 7*n - 12)/24.at n=24A014309Expansion of solution of functional equation.at n=9A112806Least number d such that 10^n -/+ d form a prime pair.at n=48A115564Expansion of (1/(2*x)) * Series_Reversion( x / ((1+x)^2 * (x+2*(1+x)^2)) ).at n=4A388913