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The way you use the [pageBlockTable]1 is little confusing as I see. You have to add apex:column tag in order to bring the columns of the table. Try below code for the table. This way you can add more columns to your table.

<apex:pageBlockTable id="sampleGrid" value="{!Contact.AccountId}" var="a">
    <apex:column >
        <apex:facet name="header">Account</apex:facet>
        <apex:inputfield label="Account"  value="{!Contact.AccountId}" />
    </apex:column>
</apex:pageBlockTable>