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| n | a(n) |
|---|---|
| 1 | 30 |
| 2 | 244 |
| 3 | 2106 |
| 4 | 16536 |
| 5 | 130446 |
| 6 | 1025430 |
| 7 | 8053490 |
| 8 | 63237238 |
| 9 | 496590056 |
| 10 | 3899177780 |
| 11 | 30617038898 |
| 12 | 240407287782 |
| 13 | 1887698838680 |
| 14 | 14822368917190 |
| 15 | 116386479715646 |
| 16 | 913876264039036 |
| 17 | 7175832414626878 |
| 18 | 56345230976142602 |
| 19 | 442427428831168274 |
[30,244,2106,16536,130446,1025430,8053490, 63237238,496590056,3899177780,30617038898, 240407287782,1887698838680,14822368917190, 116386479715646,913876264039036,7175832414626878, 56345230976142602,442427428831168274] |