10909657044domain: NAppears in sequencesa(n) = 3^n*(2*n)!/(n!)^2.at n=10A098658Expansion of e.g.f. BesselI(0,2*sqrt(3)*x) + BesselI(1,2*sqrt(3)*x)/sqrt(3).at n=20A098662Expansion of (sqrt(1-12*x^2)+12*x^2+2*x-1)/(2*x*sqrt(1-12*x^2)).at n=20A103978a(n) = binomial(n+10, 10)*3^n.at n=10A172362