let strings = 20;
let columns = 10;

let myTable = [];
let counter = 0;

for (let y = 0; y < columns; y++){
    let tempTable = [];
    for(let x = 0; x < strings; x++){
        counter++;
        tempTable.push(counter);    
    }
    myTable.push(tempTable);
}
console.table(myTable);