A086657 Write decimal expansion of e in triangular form; sequence gives right edge.

2, 1, 8, 8, 4, 6, 1, 9, 9, 4, 2, 4, 8, 6, 2, 3, 9, 4, 3, 8, 8, 2, 4, 6, 4, 0, 4, 6, 8, 6, 8, 8, 9, 9, 7, 0, 6, 6, 1, 1, 9, 6, 3, 8, 2, 3, 5, 2, 2, 7, 2, 5, 9, 1, 5, 4, 8, 8, 3, 5, 4, 5, 9, 2, 1, 6, 0, 0, 3, 7, 1, 4, 6, 5, 8, 7, 3, 0, 2, 9, 6, 9, 2, 6, 2, 8, 7, 8, 7, 2, 7, 9, 5, 7, 4, 7, 9, 7, 4, 9