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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 17 |
| 3 | 74 |
| 4 | 315 |
| 5 | 1343 |
| 6 | 5734 |
| 7 | 24495 |
| 8 | 104655 |
| 9 | 447152 |
| 10 | 1910521 |
| 11 | 8162971 |
| 12 | 34877432 |
| 13 | 149018667 |
| 14 | 636702899 |
| 15 | 2720401314 |
| 16 | 11623291351 |
| 17 | 49662121961 |
| 18 | 212188293616 |
| 19 | 906603869753 |
| 20 | 3873590586251 |
| 21 | 16550452221246 |
| 22 | 70714099135861 |
[1,17,74,315,1343,5734,24495,104655,447152, 1910521,8162971,34877432,149018667,636702899, 2720401314,11623291351,49662121961,212188293616, 906603869753,3873590586251,16550452221246, 70714099135861] |