Add the calculation of AIC and AICc. See the help manual of regsubsets function of the leaps package
# S3 method for armasubsets
summary(object, all.best = TRUE, matrix = TRUE, matrix.logical = FALSE,
df = NULL, ...)
armasubsets object
Show all the best subsets or just one of each size
Show a matrix of the variables in each model or just summary statistics
With matrix=TRUE, the matrix is logical TRUE/FALSE or string "*"/code" "
Specify a number of degrees of freedom for the summary statistics. The default is n-1
Other arguments for future methods