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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 30 |
| 6 | 103 |
| 7 | 423 |
| 8 | 1898 |
| 9 | 9186 |
| 10 | 48459 |
| 11 | 277813 |
| 12 | 1682335 |
| 13 | 10842496 |
| 14 | 73622545 |
| 15 | 532098309 |
| 16 | 4013332419 |
| 17 | 31553670222 |
| 18 | 258169433450 |
| 19 | 2231159821028 |
| 20 | 19826045896926 |
| 21 | 182181813932571 |
| 22 | 1733395478474786 |
| 23 | 17237091890882863 |
[1,2,4,11,30,103,423,1898,9186,48459,277813, 1682335,10842496,73622545,532098309,4013332419, 31553670222,258169433450,2231159821028, 19826045896926,182181813932571,1733395478474786, 17237091890882863] |