24216338432domain: NAppears in sequencesa(n) = 4^n*binomial(2*n+1, n).at n=9A098400Expansion of e.g.f. BesselI(0,4*x)+BesselI(1,4*x)/2.at n=19A098664a(n) = binomial(n+10, 10)*4^n.at n=9A172978