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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 22 |
| 4 | 105 |
| 5 | 506 |
| 6 | 2492 |
| 7 | 12405 |
| 8 | 62337 |
| 9 | 315445 |
| 10 | 1605340 |
| 11 | 8207563 |
| 12 | 42124380 |
| 13 | 216903064 |
| 14 | 1119974875 |
| 15 | 5796944357 |
| 16 | 30068145905 |
| 17 | 156250892610 |
| 18 | 813310723925 |
| 19 | 4239676354650 |
| 20 | 22130265931900 |
| 21 | 115654632452535 |
| 22 | 605081974091875 |
| 23 | 3168828466966388 |
| 24 | 16610409114771900 |
[1,1,5,22,105,506,2492,12405,62337,315445,1605340, 8207563,42124380,216903064,1119974875,5796944357, 30068145905,156250892610,813310723925, 4239676354650,22130265931900,115654632452535, 605081974091875,3168828466966388, 16610409114771900] |