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A147730 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 16 |
| 5 | 54 |
| 6 | 232 |
| 7 | 936 |
| 8 | 3880 |
| 9 | 17302 |
| 10 | 81584 |
| 11 | 409012 |
| 12 | 2138674 |
| 13 | 11754832 |
| 14 | 66857094 |
| 15 | 395646912 |
| 16 | 2409911234 |
| 17 | 15175510148 |
[1,2,6,16,54,232,936,3880,17302,81584,409012, 2138674,11754832,66857094,395646912,2409911234, 15175510148] |