I'm having trouble working out a formula using this experience curve to get the total exp after each level. I bet its easy and im just over thinking it.

maxlvl = 10;
increment = 28;
baseexp = 100;
function calc(){
    for (i = 0;i<(maxlvl*increment);i+=increment){
        expperlvl = baseexp + i;
        document.writeln(expperlvl);
    }
}

I figured it out.

maxlvl=6;
base=200;
increment=56;
function total(){
    totalxp= (base*(maxlvl-1))+(increment*(maxlvl-2)*(maxlvl-1)/2);
    document.write(totalxp);
}