A086658 Write decimal expansion of e in triangular form; sequence gives left edge.
2, 7, 8, 1, 4, 5, 0, 3, 7, 3, 9, 4, 7, 5, 6, 1, 5, 5, 3, 1, 7, 4, 2, 5, 9, 5, 6, 7, 8, 9, 7, 7, 2, 6, 4, 9, 9, 1, 6, 0, 9, 3, 8, 7, 8, 7, 6, 6, 7, 1, 2, 5, 1, 5, 0, 7, 0, 3, 0, 5, 4, 2, 2, 2, 5, 7, 8, 0, 5, 2, 4, 2, 0, 9, 1, 9, 4, 7, 4, 7, 0, 1, 9, 7, 1, 8, 7, 8, 7, 0, 8, 3, 3, 9, 2, 7, 2, 9, 6, 9
Offset: 1
Examples
Triangle is 2 71 828 1828 45904 523536 0287471 35266249 775724709 3699959574 96696762772 407663035354