A241053 - OEIS

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A241053 as a simple table

n	a(n)
1	10
2	18
3	60
4	163
5	598
6	3411
7	11283
8	72578
9	404421
10	2220973
11	15323311
12	89098530
13	555805615
14	3439171493
15	20036872248
16	122952210402
17	718794479207
18	4313956945052
19	26242676909613
20	154481099979249
21	936900491409907

[10,18,60,163,598,3411,11283,72578,404421,2220973, 15323311,89098530,555805615,3439171493, 20036872248,122952210402,718794479207, 4313956945052,26242676909613,154481099979249, 936900491409907]