The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 29 |
| 3 | 112 |
| 4 | 436 |
| 5 | 1708 |
| 6 | 6724 |
| 7 | 26572 |
| 8 | 105316 |
| 9 | 418348 |
| 10 | 1664644 |
| 11 | 6632332 |
| 12 | 26450596 |
| 13 | 105566188 |
| 14 | 421556164 |
| 15 | 1684098892 |
| 16 | 6730018276 |
| 17 | 26900941228 |
| 18 | 107546369284 |
| 19 | 430013290252 |
| 20 | 1719536600356 |
| 21 | 6876596719468 |
| 22 | 27501737832004 |
| 23 | 109993004190412 |
[9,29,112,436,1708,6724,26572,105316,418348, 1664644,6632332,26450596,105566188,421556164, 1684098892,6730018276,26900941228,107546369284, 430013290252,1719536600356,6876596719468, 27501737832004,109993004190412] |