Interesting though the number seems not exactly determined. The official Norwegian database mentions both the number 52 and 56. Apart from this there are some grooves. Guess a more thorough examination (frottage or laser scan) may be needed to be more certain. Apart from this it is not in situ and quite likely only a fragment of a larger stone which has been fitted into square-shape in historic times. Hence carved parts may be lost. Cheers :)
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