What is the MSE?

Using QM for Windows, the forecast is and the MSE $=($ignoring the first error$).$

This MSE is higher than the MSE found using a trend line, so the trend line provides better forecasts. However, other values for the two smoothing constants might result in better forecasts and a lower MSE.

$3.$ With a smoothing constant of $0\mathrm{.}4,$ the forecast for $2014$ is with MSE$=($ignoring the first error$)$