A099938 - cp's OEIS frontend

A099938 Consider the sequence of circles C0, C1, C2, C3 ..., where C0 is a half-circle of radius 1. C1 is the largest circle that fits into C0 and has radius 1/2. C(n+1) is the largest circle that fits inside C0 but outside C(n), etc. Sequence gives the curvatures (reciprocals of the radii) of the circles.

n	a(n)
1	2
2	4
3	18
4	100
5	578
6	3364
7	19602
8	114244
9	665858
10	3880900
11	22619538
12	131836324
13	768398402
14	4478554084
15	26102926098
16	152139002500
17	886731088898
18	5168247530884
19	30122754096402
20	175568277047524
21	1023286908188738
22	5964153172084900
23	34761632124320658

[2, 4, 18, 100, 578, 3364, 19602, 114244, 665858, 3880900, 22619538, 131836324, 768398402, 4478554084, 26102926098, 152139002500, 886731088898, 5168247530884, 30122754096402, 175568277047524, 1023286908188738, 5964153172084900, 34761632124320658]

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