54419558400domain: NAppears in sequencesa(n) = Sum_{k=0..2n} (k+1) * A026519(n, k).at n=24A027266a(n) = Sum_{k=0..2n} (k+1)*T(n,k), where T is given by A026536.at n=24A027271a(n) = 25*6^(n-2), with a(0)=1 and a(1)=4.at n=14A055846a(n) = (n^3 - n^2)*6^n.at n=9A128989a(n) = (2*n + 1)*6^n.at n=12A199299