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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 25 |
| 3 | 200 |
| 4 | 1602 |
| 5 | 12819 |
| 6 | 102553 |
| 7 | 820424 |
| 8 | 6563394 |
| 9 | 52507155 |
| 10 | 420057241 |
| 11 | 3360457928 |
| 12 | 26883663426 |
| 13 | 215069307411 |
| 14 | 1720554459289 |
| 15 | 13764435674312 |
| 16 | 110115485394498 |
| 17 | 880923883155987 |
| 18 | 7047391065247897 |
[3,25,200,1602,12819,102553,820424,6563394, 52507155,420057241,3360457928,26883663426, 215069307411,1720554459289,13764435674312, 110115485394498,880923883155987,7047391065247897] |