| n | a(n) |
|---|---|
| 1 | 31 |
| 2 | 961 |
| 3 | 6634 |
| 4 | 45796 |
| 5 | 186822 |
| 6 | 762129 |
| 7 | 2330037 |
| 8 | 7123561 |
| 9 | 18090482 |
| 10 | 45941284 |
| 11 | 102402024 |
| 12 | 228251664 |
| 13 | 461670264 |
| 14 | 933791364 |
| 15 | 1751615118 |
| 16 | 3285697041 |
| 17 | 5802776793 |
| 18 | 10248120289 |
| 19 | 17226819610 |
| 20 | 28957828900 |
| 21 | 46710814150 |
| 22 | 75347505025 |
[31,961,6634,45796,186822,762129,2330037,7123561, 18090482,45941284,102402024,228251664,461670264, 933791364,1751615118,3285697041,5802776793, 10248120289,17226819610,28957828900,46710814150, 75347505025] |