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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 966 |
| 3 | 26578 |
| 4 | 309452 |
| 5 | 2160160 |
| 6 | 10755158 |
| 7 | 42158796 |
| 8 | 138336744 |
| 9 | 395723154 |
| 10 | 1015071750 |
| 11 | 2382851790 |
| 12 | 5197343476 |
| 13 | 10655843900 |
| 14 | 20723014006 |
| 15 | 38504379320 |
| 16 | 68753342352 |
| 17 | 118544772606 |
| 18 | 198153311046 |
| 19 | 322179959658 |
| 20 | 510976323420 |
[6,966,26578,309452,2160160,10755158,42158796, 138336744,395723154,1015071750,2382851790, 5197343476,10655843900,20723014006,38504379320, 68753342352,118544772606,198153311046, 322179959658,510976323420] |