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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 20 |
| 4 | 21 |
| 5 | 42 |
| 6 | 120 |
| 7 | 342 |
| 8 | 506 |
| 9 | 567 |
| 10 | 594 |
| 11 | 600 |
| 12 | 610 |
| 13 | 2184 |
| 14 | 4896 |
| 15 | 6108 |
| 16 | 6162 |
| 17 | 6498 |
| 18 | 12760 |
| 19 | 14067 |
| 20 | 14157 |
| 21 | 14201 |
| 22 | 93942 |
| 23 | 123462 |
| 24 | 123519 |
| 25 | 734413 |
| 26 | 2451397 |
| 27 | 4591010 |
| 28 | 11571129 |
| 29 | 13346540 |
| 30 | 13619348 |
| 31 | 13619790 |
| 32 | 46180567 |
[1,6,20,21,42,120,342,506,567,594,600,610,2184, 4896,6108,6162,6498,12760,14067,14157,14201,93942, 123462,123519,734413,2451397,4591010,11571129, 13346540,13619348,13619790,46180567] |