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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 59 |
| 4 | 362 |
| 5 | 2277 |
| 6 | 14581 |
| 7 | 94572 |
| 8 | 619242 |
| 9 | 4084538 |
| 10 | 27099435 |
| 11 | 180651913 |
| 12 | 1209036725 |
| 13 | 8118629365 |
| 14 | 54671662692 |
| 15 | 369071775684 |
| 16 | 2496852123882 |
| 17 | 16923762715911 |
| 18 | 114902801532622 |
| 19 | 781296976824693 |
| 20 | 5319705042364587 |
| 21 | 36265061394634215 |
| 22 | 247497082392976415 |
[1,2,10,59,362,2277,14581,94572,619242,4084538, 27099435,180651913,1209036725,8118629365, 54671662692,369071775684,2496852123882, 16923762715911,114902801532622,781296976824693, 5319705042364587,36265061394634215, 247497082392976415] |