New in version 2.0.
Remove sequence elements at indices:
abjad> from abjad.tools import sequencetools
abjad> sequencetools.remove_sequence_elements_at_indices(range(20), [1, 16, 17, 18])
[0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 19]
Ignore negative indices.
Return list.