+1+3+5+7… ascending from A0 to F#7 (+17) & descending from F#7 to A0 (-17)
Complete scale: A0, Bb0, C#1, F#1, C#2, D2, Bb2, F3, A3, F#4, Bb4, F5, C#6, D6, A6, D7, F7, F#7
IC sequence: 1,3, 5, 7, 1, 8, 7, 4, 9, 4, 7, 8, 1, 7, 5, 3, 1