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| n | a(n) |
|---|---|
| 1 | 530 |
| 2 | 1818 |
| 3 | 6230 |
| 4 | 21610 |
| 5 | 76110 |
| 6 | 270598 |
| 7 | 968942 |
| 8 | 3485538 |
| 9 | 12580830 |
| 10 | 45517150 |
| 11 | 164970110 |
| 12 | 598685226 |
| 13 | 2174802030 |
| 14 | 7906183238 |
| 15 | 28758522030 |
| 16 | 104655742642 |
| 17 | 380990823486 |
| 18 | 1387358367918 |
| 19 | 5053131325982 |
| 20 | 18408177907066 |
| 21 | 67069331582158 |
[530,1818,6230,21610,76110,270598,968942,3485538, 12580830,45517150,164970110,598685226,2174802030, 7906183238,28758522030,104655742642,380990823486, 1387358367918,5053131325982,18408177907066, 67069331582158] |