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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 432 |
| 3 | 572 |
| 4 | 2929 |
| 5 | 19185 |
| 6 | 97864 |
| 7 | 608947 |
| 8 | 3605691 |
| 9 | 21632912 |
| 10 | 130126938 |
| 11 | 786109991 |
| 12 | 4751981159 |
| 13 | 28759129674 |
| 14 | 174064729330 |
| 15 | 1053884433839 |
| 16 | 6381829345230 |
| 17 | 38648680713625 |
| 18 | 234069146890789 |
| 19 | 1417642335234655 |
| 20 | 8586113353402760 |
[64,432,572,2929,19185,97864,608947,3605691, 21632912,130126938,786109991,4751981159, 28759129674,174064729330,1053884433839, 6381829345230,38648680713625,234069146890789, 1417642335234655,8586113353402760] |