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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 89 |
| 3 | 536 |
| 4 | 3357 |
| 5 | 21464 |
| 6 | 138645 |
| 7 | 899860 |
| 8 | 5852687 |
| 9 | 38099072 |
| 10 | 248105251 |
| 11 | 1615963560 |
| 12 | 10525963187 |
| 13 | 68565944112 |
| 14 | 446645329321 |
| 15 | 2909516286464 |
| 16 | 18953111619005 |
| 17 | 123464205731360 |
| 18 | 804270242627253 |
| 19 | 5239177554585924 |
[16,89,536,3357,21464,138645,899860,5852687, 38099072,248105251,1615963560,10525963187, 68565944112,446645329321,2909516286464, 18953111619005,123464205731360,804270242627253, 5239177554585924] |