This "blues" is based on an unusual 8-note scale containing these notes: E-F-G-A#-B-C-C#-D-E, so although it has a 12-bar structure, the chords are a bit strange.
Sheet music for this weird "blues" is available here: https://pianopronto.com/composers-community/stacy-fahrion/stacy-fahrion-sideways-blues/