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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 3 |
| 3 | 3 |
| 4 | 30 |
| 5 | 57 |
| 6 | 84 |
| 7 | 867 |
| 8 | 1893 |
| 9 | 3162 |
| 10 | 33132 |
| 11 | 76953 |
| 12 | 136812 |
| 13 | 1446204 |
| 14 | 3478764 |
| 15 | 6420387 |
| 16 | 68260134 |
| 17 | 167946159 |
| 18 | 317782524 |
| 19 | 3392340186 |
| 20 | 8479140510 |
| 21 | 16332164868 |
| 22 | 174873206424 |
| 23 | 442212416121 |
| 24 | 863222622780 |
| 25 | 9264327739716 |
| 26 | 23637757714788 |
| 27 | 46624054987452 |
[1,3,3,3,30,57,84,867,1893,3162,33132,76953, 136812,1446204,3478764,6420387,68260134,167946159, 317782524,3392340186,8479140510,16332164868, 174873206424,442212416121,863222622780, 9264327739716,23637757714788,46624054987452] |