1818276174domain: NAppears in sequencesa(n) = 3^n*binomial(2*n+1, n).at n=9A098399Expansion of e.g.f. BesselI(0,2*sqrt(3)*x) + BesselI(1,2*sqrt(3)*x)/sqrt(3).at n=19A098662a(n) = binomial(n+10, 10)*3^n.at n=9A172362a(n) = 2*12^n*Gamma(n+1/2)*(n+1)/(sqrt(Pi)*Gamma(n+3)).at n=10A275607