A084652 Engel expansion for tan(1).
1, 2, 9, 30, 5838, 7748, 18941, 20860, 884009, 919276, 6366597, 74329482, 178532068, 2130862251, 2162384953, 2614341660, 4416513965, 10812791039, 11799700554, 20743576863, 36600453328, 76931780134, 109063095528
Offset: 0