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A200725 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 16 |
| 4 | 76 |
| 5 | 399 |
| 6 | 2206 |
| 7 | 12664 |
| 8 | 74790 |
| 9 | 451420 |
| 10 | 2772313 |
| 11 | 17267652 |
| 12 | 108821293 |
| 13 | 692609446 |
| 14 | 4445642625 |
| 15 | 28744599748 |
| 16 | 187047449289 |
| 17 | 1224027357216 |
| 18 | 8050074481917 |
| 19 | 53179900898596 |
| 20 | 352726704965748 |
| 21 | 2348036826102013 |
| 22 | 15682048658695168 |
| 23 | 105052549830928908 |
| 24 | 705678173069959645 |
[1,1,4,16,76,399,2206,12664,74790,451420,2772313, 17267652,108821293,692609446,4445642625, 28744599748,187047449289,1224027357216, 8050074481917,53179900898596,352726704965748, 2348036826102013,15682048658695168, 105052549830928908,705678173069959645] |