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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 38 |
| 5 | 190 |
| 6 | 1142 |
| 7 | 7996 |
| 8 | 63968 |
| 9 | 575713 |
| 10 | 5757138 |
| 11 | 63328518 |
| 12 | 759942216 |
| 13 | 9879248812 |
| 14 | 138309483370 |
| 15 | 2074642250562 |
| 16 | 33194276008993 |
| 17 | 564302692152896 |
| 18 | 10157448458752137 |
| 19 | 192991520716290617 |
| 20 | 3859830414325812341 |
[1,3,9,38,190,1142,7996,63968,575713,5757138, 63328518,759942216,9879248812,138309483370, 2074642250562,33194276008993,564302692152896, 10157448458752137,192991520716290617, 3859830414325812341] |