You can do this by editing the postbit or postbit_legacy template (vB <= 3.6.8) or use one of the new hook locations in vb 3.7
vB 3.7 has new template where you can directly fill in your Adsense code.
ADMINCP - STYLES & TEMPLATES - Choose your style - CHANGE TEMPLATES - ADD LOCATION - ad_showthread_firstpost
If you fill in something in this template the content will be shown after each first post.
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