A13#11 chord for piano presented by keyboard diagrams.
Explanation: The A13#11 alter the A13 by the change of one note. The A thirteenth sharp eleventh is a seven-note chord, but due to practical circumstances, one or more notes (the fifth primarily) are omitted. The chord name can also be written as A13(#11) or A13+11.
Theory: Compared to A13 the eleventh tone in the chord is sharpenedThe tone is one half step higher.
Notes: A - C# - E - G - B - D# - F#