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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 19 |
| 4 | 103 |
| 5 | 376 |
| 6 | 1825 |
| 7 | 7547 |
| 8 | 35175 |
| 9 | 153838 |
| 10 | 708132 |
| 11 | 3181091 |
| 12 | 14616481 |
| 13 | 66582283 |
| 14 | 306501377 |
| 15 | 1407473269 |
| 16 | 6497464679 |
| 17 | 29991098982 |
| 18 | 138844558150 |
| 19 | 643215119214 |
| 20 | 2985368996228 |
| 21 | 13868212710623 |
| 22 | 64508509024241 |
| 23 | 300324344452479 |
| 24 | 1399598738196897 |
| 25 | 6527698842078501 |
[1,1,7,19,103,376,1825,7547,35175,153838,708132, 3181091,14616481,66582283,306501377,1407473269, 6497464679,29991098982,138844558150,643215119214, 2985368996228,13868212710623,64508509024241, 300324344452479,1399598738196897,6527698842078501] |