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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 37 |
| 5 | 118 |
| 6 | 525 |
| 7 | 2059 |
| 8 | 9934 |
| 9 | 44937 |
| 10 | 233683 |
| 11 | 1177360 |
| 12 | 6552069 |
| 13 | 35986069 |
| 14 | 212891932 |
| 15 | 1256487933 |
| 16 | 7856137825 |
| 17 | 49320239614 |
| 18 | 324285063489 |
| 19 | 2149133929207 |
| 20 | 14796251405278 |
| 21 | 102910742502765 |
| 22 | 739149552929719 |
| 23 | 5370132965554144 |
| 24 | 40110161953250937 |
[1,4,9,37,118,525,2059,9934,44937,233683,1177360, 6552069,35986069,212891932,1256487933,7856137825, 49320239614,324285063489,2149133929207, 14796251405278,102910742502765,739149552929719, 5370132965554144,40110161953250937] |