Unfortunately, the Google Graphics API does not support more than one color for each series.
You could fake it, having several rows, one value:
function drawVisualization() {
var data = google.visualization.arrayToDataTable([
['Sequence', '1', '2', '3', '4', '5', '6'],
['', 1,1,2,3,5,8],
]);
new google.visualization.ColumnChart(document.getElementById('visualization')).
draw(data,
{title:"Fibonacci",
width:600, height:400}
);
}

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