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| n | a(n) |
|---|---|
| 0 | 28 |
| 1 | 309 |
| 2 | 1264 |
| 3 | 1573 |
| 4 | 2837 |
| 5 | 7247 |
| 6 | 24578 |
| 7 | 31825 |
| 8 | 438303 |
| 9 | 1346734 |
| 10 | 1785037 |
| 11 | 4916808 |
| 12 | 90287581 |
| 13 | 185491970 |
| 14 | 275779551 |
| 15 | 1012830623 |
| 16 | 13442577650 |
| 17 | 14455408273 |
| 18 | 56808802469 |
| 19 | 128073013211 |
| 20 | 184881815680 |
[28,309,1264,1573,2837,7247,24578,31825,438303, 1346734,1785037,4916808,90287581,185491970, 275779551,1012830623,13442577650,14455408273, 56808802469,128073013211,184881815680] |