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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 29 |
| 5 | 103 |
| 6 | 393 |
| 7 | 1523 |
| 8 | 5985 |
| 9 | 24617 |
| 10 | 102357 |
| 11 | 430363 |
| 12 | 1838761 |
| 13 | 7931043 |
| 14 | 34615153 |
| 15 | 152208659 |
| 16 | 673421637 |
| 17 | 3003153451 |
| 18 | 13464915837 |
| 19 | 60712552141 |
| 20 | 275067241835 |
| 21 | 1251061909991 |
| 22 | 5715825705399 |
| 23 | 26206169918477 |
| 24 | 120562798767589 |
| 25 | 556428210284773 |
| 26 | 2574906598392645 |
| 27 | 11950271335525375 |
| 28 | 55598176180817699 |
[1,1,3,9,29,103,393,1523,5985,24617,102357,430363, 1838761,7931043,34615153,152208659,673421637, 3003153451,13464915837,60712552141,275067241835, 1251061909991,5715825705399,26206169918477, 120562798767589,556428210284773,2574906598392645, 11950271335525375,55598176180817699] |