| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 10 |
| 5 | 32 |
| 6 | 95 |
| 7 | 306 |
| 8 | 978 |
| 9 | 3235 |
| 10 | 10767 |
| 11 | 36470 |
| 12 | 124514 |
| 13 | 429648 |
| 14 | 1492944 |
| 15 | 5225700 |
| 16 | 18396350 |
| 17 | 65115694 |
| 18 | 231555165 |
| 19 | 826956617 |
| 20 | 2964543205 |
| 21 | 10664540170 |
| 22 | 38484972969 |
| 23 | 139281469165 |
| 24 | 505408580484 |
| 25 | 1838442927937 |
| 26 | 6702466323520 |
| 27 | 24486411113076 |
| 28 | 89630823136513 |
| 29 | 328680670354328 |
| 30 | 1207323483992684 |
| 31 | 4441801238353311 |
| 32 | 16365832987077134 |
| 33 | 60384021404260146 |
| 34 | 223087697417538491 |
[1,1,1,4,10,32,95,306,978,3235,10767,36470,124514, 429648,1492944,5225700,18396350,65115694, 231555165,826956617,2964543205,10664540170, 38484972969,139281469165,505408580484, 1838442927937,6702466323520,24486411113076, 89630823136513,328680670354328,1207323483992684, 4441801238353311,16365832987077134, 60384021404260146,223087697417538491] |