integer sequence created by arrbxr - https://repl.it/@arrbxr/integer-sequence

index.js

function sequence(seq) {
    var bad = 0
    for(var i=1;i<seq.length;i++) {
        if(seq[i]<=seq[i-1]) {
            bad++
            if(bad>1) {
                return false
            }
            if(seq[i]<=seq[i-2]&&seq[i+1]<=seq[i-1]) {
                return false
            }
        }
    }
  return true
}

sequence([1,1,2,8,3,2,4,5])