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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 1 |
| 4 | 28 |
| 5 | 63 |
| 6 | 1386 |
| 7 | 1287 |
| 8 | 10296 |
| 9 | 14586 |
| 10 | 277134 |
| 11 | 323323 |
| 12 | 89237148 |
| 13 | 22309287 |
| 14 | 401567166 |
| 15 | 5822723907 |
| 16 | 2888071057872 |
| 17 | 722017764468 |
| 18 | 361008882234 |
| 19 | 6678664321329 |
| 20 | 26714657285316 |
| 21 | 39117891024927 |
| 22 | 3364138628143722 |
[1,6,1,28,63,1386,1287,10296,14586,277134,323323, 89237148,22309287,401567166,5822723907, 2888071057872,722017764468,361008882234, 6678664321329,26714657285316,39117891024927, 3364138628143722] |