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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 434 |
| 3 | 4928 |
| 4 | 45619 |
| 5 | 363804 |
| 6 | 2584078 |
| 7 | 16712728 |
| 8 | 99967861 |
| 9 | 559436136 |
| 10 | 2954968758 |
| 11 | 14835042600 |
| 12 | 71185664242 |
| 13 | 327991293140 |
| 14 | 1456679962528 |
| 15 | 6256129706904 |
| 16 | 26054952884072 |
| 17 | 105476694483636 |
| 18 | 415919297844582 |
[1,28,434,4928,45619,363804,2584078,16712728, 99967861,559436136,2954968758,14835042600, 71185664242,327991293140,1456679962528, 6256129706904,26054952884072,105476694483636, 415919297844582] |