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| n | a(n) |
|---|---|
| 1 | 1331 |
| 2 | 2864 |
| 3 | 6986 |
| 4 | 15208 |
| 5 | 42345 |
| 6 | 111519 |
| 7 | 294801 |
| 8 | 852023 |
| 9 | 2391671 |
| 10 | 6526332 |
| 11 | 19388874 |
| 12 | 55236910 |
| 13 | 154718356 |
| 14 | 459605140 |
| 15 | 1324410518 |
| 16 | 3750331025 |
| 17 | 11134189835 |
| 18 | 32227560268 |
| 19 | 92034892492 |
| 20 | 272465735794 |
| 21 | 791324270153 |
| 22 | 2272219351820 |
[1331,2864,6986,15208,42345,111519,294801,852023, 2391671,6526332,19388874,55236910,154718356, 459605140,1324410518,3750331025,11134189835, 32227560268,92034892492,272465735794,791324270153, 2272219351820] |