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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 28 |
| 5 | 96 |
| 6 | 363 |
| 7 | 1322 |
| 8 | 5361 |
| 9 | 20650 |
| 10 | 85822 |
| 11 | 346922 |
| 12 | 1468980 |
| 13 | 6087326 |
| 14 | 26262665 |
| 15 | 110856469 |
| 16 | 484244554 |
| 17 | 2079234507 |
| 18 | 9165138514 |
| 19 | 39846024767 |
| 20 | 177114782991 |
| 21 | 777413068286 |
| 22 | 3479412523818 |
| 23 | 15404124085873 |
| 24 | 69320866311769 |
| 25 | 309094501365045 |
| 26 | 1397779744401443 |
| 27 | 6269028478432336 |
| 28 | 28471358338540973 |
[1,1,3,8,28,96,363,1322,5361,20650,85822,346922, 1468980,6087326,26262665,110856469,484244554, 2079234507,9165138514,39846024767,177114782991, 777413068286,3479412523818,15404124085873, 69320866311769,309094501365045,1397779744401443, 6269028478432336,28471358338540973] |