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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 12 |
| 3 | 532 |
| 4 | 2324 |
| 5 | 9854 |
| 6 | 38972 |
| 7 | 146606 |
| 8 | 533340 |
| 9 | 1896352 |
| 10 | 6625144 |
| 11 | 22832024 |
| 12 | 77840640 |
| 13 | 263040538 |
| 14 | 882310796 |
| 15 | 2941006434 |
| 16 | 9750587480 |
| 17 | 32176182992 |
| 18 | 105744971236 |
| 19 | 346270006718 |
| 20 | 1130247359072 |
| 21 | 3678591411860 |
| 22 | 11941616925216 |
[0,12,532,2324,9854,38972,146606,533340,1896352, 6625144,22832024,77840640,263040538,882310796, 2941006434,9750587480,32176182992,105744971236, 346270006718,1130247359072,3678591411860, 11941616925216] |