54492397568domain: NAppears in sequencesa(n) = n*(n+1)*2^(n-2).at n=28A001788Denominators of a BBP-like formula for 4*Pi/sqrt(27).at n=9A260659Expansion of (2 x^4*(5 - 12*x + 8*x^2))/(1 - 2*x)^4.at n=27A268462