+2+4+6… ascending from A0 to A6 (+14) & descending from A6 to A0 (-14)
Complete scale: A0, B0, Eb1, A1, C#2, F2, Eb3, Eb4, C#5, F5, A5, Eb6, G6, A6
IC sequence: 2, 4, 6, 4, 4, 10, 12, 10, 4, 4, 6, 4, 2